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SVC 810 Tankless Troubleshooting Manual Table of Contents Specifications common to all product lines ................................................................................ 4 Product (Model) History .............................................................................................................. 5 Sequence of Operations ................................................................................................................ 7 Sensors and Safety ..................................
SVC 810 Tankless Troubleshooting Manual Troubleshooting .......................................................................................................................... 40 Troubleshooting Format and Example...................................................................................... 40 Unit Will Not Power On ........................................................................................................... 41 Error Code 00...........................................................
SVC 810 Tankless Troubleshooting Manual Burner Assembly ...................................................................................................................... 69 Igniter and Igniter Probes.......................................................................................................... 70 Flame Rod(s)............................................................................................................................. 70 Heat Exchanger Thermistor ...............................
SVC 810 Tankless Troubleshooting Manual Specifications common to all product lines Model Purpose Rated Gas Input (Btu/Hr.) Modulating Dimensions Installation Working Water Pressure Minimum Water Flow Maximum Flow Rate Gas Connection Water Connection Vent Size Max.
SVC 810 Tankless Troubleshooting Manual Product (Model) History Implementation Date September 2004 Models Affected RTG42 May 2005 Dec 2006 RTG74 RTG74 RTG74 Modification/Upgrade n/a Board Programming n/a n/a n/a Upgraded product launch on n/a new chassis No air filter switch n/a Initial Product Launch n/a n/a No air filter switch Added EZ link function to all similar models Added UMC Main remote control as standard to all models; allowed residential units to heat to 1400 F Removed 60 minute loc
SVC 810 Tankless Troubleshooting Manual Implementation Date December 5, 2006 July 1, 2008 Models Affected ‘dash two’ model Modification/Upgrade New Parts Flame rod and igniter on Burner right hand burner swapped; added a ‘target’ for the spark to hit Improved burner cover plate Burner cover plate New programming chip – Programming all RTG74 models. The new Chips; this is burner plate cover modified when the 2 the air flow characteristics. chips in a bag This means the chip started.
SVC 810 Tankless Troubleshooting Manual Sequence of Operations Action Hot water faucet is open creating a demand Explanation Hot water draw initiates water flow thru the machine. Water flows through the Water Flow Sensor Minimum flow rate of .66 gallons per minute. Printed Circuit Board (PCB) senses the flow rate has reached a minimum demand of 0.66 gpm PCB is the ‘brains’ of the machine and controls all input and actions during sequence of operations.
SVC 810 Tankless Troubleshooting Manual Action (For indoor model only) When the air intake is blocked, or oxygen in a room is not sufficient, the output of the thermocouple that is located in the Oxygen Depletion Sensing Burner (ODS) will change. Explanation The PC Board senses this change and controls the Fan and Proportional Gas Control Valve in order to prevent imperfect combustion. If the control board cannot correct such condition, the unit will go into an error code.
SVC 810 Tankless Troubleshooting Manual 4 5 6 7 8 No Second attempt by the PCB to increase the airflow rate to balance the air-fuel mixture. Is the ODS thermocouple detecting normal temperatures? No Third attempt by the PCB to increase the airflow rate to balance the air-fuel mixture. Yes PCB continues to try to fix the air-fuel mixture my adding airflow. It now adds a visual alarm on the Remote Control by flashing both the red and green indicators. Unit is operating normally.
SVC 810 Tankless Troubleshooting Manual Heat Exchanger Thermistor The Heat Exchanger Thermistor monitors the temperature of the water inside the heat exchanger. It will activate to Error Code 15 if the water temperature exceeds 207º F for more than 15 seconds; or 230º F for more than 1 second. It will also show an Error Code 32 if the thermistor is disconnected from the circuit board. Maintenance Panel Display The Rheem Tankless has a Maintenance Display chart on the remote control panel.
SVC 810 Tankless Troubleshooting Manual Clearing the Fault History 1. Turn the unit OFF. Remove the front cover. Locate the dip switches on the control board. 2. Make sure all the dip switches are OFF (down position). 3. Locate the #1 dip switch and turn it ON; then turn it OFF. 4. Within 5 seconds of turning the dip switch off, press and hold the MIN (SW1) or MAX (SW2) button for at least 2 seconds. 5. The remote control will flash briefly. This is your signal that the fault history has been cleared. 6.
SVC 810 Tankless Troubleshooting Manual operating water flow. b. Push the Adjusting Button on the PC Board. [LH] is displayed on the LED of remote control. c. Hold the Adjusting Button; push the "SW1" button on the PC Board. The current number [01 - 39] is displayed on the LED of remote control. NOTE: Every time you press the MIN button, the display will cycle up to the number 39. Once it reaches 39, it will automatically reverse and cycle back down to 1. d.
SVC 810 Tankless Troubleshooting Manual 53XP 53XN 53DVP 53DVN 74DVP 74DVN 3.46 + fan pressure (max.) 2.83 + fan pressure (max.) 3.01 + fan pressure (max.) 2.95 + fan pressure (max.) 7.28 + fan pressure (max.) 2.36 0.55 + fan pressure (min.) 0.49 + fan pressure (min.) 0.37 + fan pressure (min.) 0.39 + fan pressure (min.) 1.15 + fan pressure (min.) 0.42 + fan pressure (min.) Program Chip Adjustment To quickly establish someone’s altitude with zip code use the following link.
SVC 810 Tankless Troubleshooting Manual DIP Switch. The LED on the PCB and the display of the remote control stops illuminating. 13. Attach the unit's front cover. 14. Turn on the gas shutoff valve and water shutoff valve. 15. Check and ensure safe operation and performance of the water heater. Changing the Maximum Temperature Setting to 140° By installing the UMC- Main Remote Control, you can adjust the maximum temperature setting to 140 degrees F.
SVC 810 Tankless Troubleshooting Manual 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Turn off remote control. Leave the unit plugged into a 120 VAC power source. Turn off the gas and water shutoff valves. Remove the front cover. Find the DIP Switch #4 located at the top left hand side of the PCB. Change the DIP Switch #4 setting to the "ON" position. DO NOT alter any other DIP Switch. The LED on the PCB is on. At the same time, the display of the Main Remote Control is on continuously.
SVC 810 Tankless Troubleshooting Manual 13 14 15 16 21 24 29 31 32 33 34 35 38 51 Ensure appliance is properly grounded. Check gas solenoid valves for open or short circuits. Check power supply for proper voltage and voltage drops. Disconnect remote control; see if it runs. Disconnect and re-connect all wiring harnesses on unit and PC board. Oxygen Depletion Sensor (Poor Ensure there is plenty of fresh air to the unit. or Improper Combustion) Unit needs 1 square inch for each 1,000 BTU of input.
SVC 810 Tankless Troubleshooting Manual Check modulating gas solenoid valve wiring harness for loose or damaged terminals. Ohm out solenoid valve. Ensure fan motor will turn freely. Motor will operate with a small 61 Combustion Fan Failure amount of restriction. Check wiring harness to motor for damaged and/or loose connections. Check venting length not to exceed max lengths and bends. Check water flow solenoid valve wiring harness for loose or damaged 65 Water Volume Control Fault terminals.
SVC 810 Tankless Troubleshooting Manual Diagnostic Points on Printed Circuit Board Measurement Point Connection Wire Color I–J U W1 – W2 BR1 – BK2 S R3 – BK2 Normal Value What you are checking? AC 90 – 110V 50K Ω – 500K Ω DC 2 - 5V (pulse) More than 1,310 pulses/minute is nominal.
SVC 810 Tankless Troubleshooting Manual Q R1 – W2 P 1–2 O W1 – W2 Is the thermo-electromotive force OK? DC8 – 30V (measured 2 minutes after combustion startup) DC8 – 30V (measured 2 minutes after combustion startup) Less than 1V DC; Less than 1Ω Is the air intake switch working? Temp °F Resistance KΩ Temp °F Resistance KΩ Temp °F Resistance KΩ Temp °F Resistance KΩ Thermistor Resistance Chart 32 33.8 35.6 37.4 39.2 41 42.8 44.6 46.4 48.2 50 51.8 53.6 55.4 57.2 59 60.8 62.6 64.4 66.2 68 69.
SVC 810 Tankless Troubleshooting Manual Fan Speed Chart 20
SVC 810 Tankless Troubleshooting Manual RTG2-42 Wiring Diagram 21
SVC 810 Tankless Troubleshooting Manual Printed Circuit Board 22
SVC 810 Tankless Troubleshooting Manual RTG 53 Wiring Diagram – RTG 53 23
SVC 810 Tankless Troubleshooting Manual Printed Circuit Board – RTG 53 24
SVC 810 Tankless Troubleshooting Manual RTG 66 Wiring Diagram 25
SVC 810 Tankless Troubleshooting Manual Printed Circuit Board The RTG 66 PCB has two set of dip switches. Dip Switch set #2 controls the high altitude settings. See the use and care manual for instructions. The procedures for changing the maximum temperature set point have also changed. See the use and care manual for instructions.
SVC 810 Tankless Troubleshooting Manual Error Code 11 (RTG66 Only) Explanation: No ignition. This error code can be cause one three different scenarios. Please match the scenario to the fault condition before you troubleshoot. At a minimum check the following in all cases: 1. Ensure you have gas to the appliance. 2. Bleed all air from gas lines. 3. Ensure appliance is properly grounded. 4. Ensure gas line, meter, and regulator are sized properly. 5.
SVC 810 Tankless Troubleshooting Manual Does the Solenoid Valve #1 have a voltage? No Replace Printed Circuit Board Measure the voltage of connector K between Black and White wires: 90 to 120 VDC Yes Does the Solenoid Valve #2 have a voltage? No Replace Printed Circuit Board Measure the voltage of connector K between Black and Red wires: 90 to 120 VDC Yes Does the Solenoid Valve #3 have a voltage? No Replace Printed Circuit Board Measure the voltage of connector K between Black and Blue wires: 90 to
SVC 810 Tankless Troubleshooting Manual Is the resistance of the Gas Inlet Solenoid Valve OK? No Replace Gas Control Assy Measure the resistance of connector K between Black and Yellow wires: 0.8 to 2.4k Ohms Yes Is the resistance of the Solenoid Valve #1 OK? No Replace Gas Control Assy Measure the resistance of connector K between Black and White wires: 0.8 to 2.
SVC 810 Tankless Troubleshooting Manual Scenario 3 – Error Code 11; main burner ignites, but shuts off after ignition.
SVC 810 Tankless Troubleshooting Manual Does the 0y display indicate any remaining flame? Yes Flame Rod Status: X=not detecting flame; O=is detecting flame 0y display 00 01 Flame Rod 1(white) X O Flame Rod 1 is the white wire at connector M and goes to the burner. Normal flame rod status in the control panel with the burner on should be 01 or detecting flame. No The water heater seems to be normal.
SVC 810 Tankless Troubleshooting Manual The water heater appears to be normal. Attempt to operate again. Is there any pulse output from the Fan Motor? Replace Fan Assembly Is there any pulse output from the Fan Motor? To measure the pulse output, turn on the fan by pushing "MAX" (SW2) Button. Measure the voltage of connector G between Blue and Yellow wires: 4 to 10 VDC (pulse) Yes Replace Printed Circuit Board No Error Code 65 (RTG66 Only) Explanation: Water Volume Control fault.
SVC 810 Tankless Troubleshooting Manual Error Code 66 (RTG66 Only) Explanation: Water By-Pass Control fault. At a minimum check the following: 1. Verify there is water flow thru the unit even if the unit does not fire. 2. Access maintenance information to determine flow rate. 3. Check all wiring connections to the water control and connector B on the Printed Circuit Board. Turn power off; unplug unit and then on again.
SVC 810 Tankless Troubleshooting Manual RTG 74 Wiring Diagram – RTG 74 A wiring diagram is also located on the inside of the front cover panel.
SVC 810 Tankless Troubleshooting Manual Printed Circuit Board – RTG 74 35
SVC 810 Tankless Troubleshooting Manual MIC-180 & EZ Link There are two kinds of communications cables when manifolding multiple tankless units. If only two like units are connected together, we call that EZ Link. This process uses a single 6 foot long cable with four colored wires at each end. You can recognize the EZ Link cable by the yellow wire at each end. These cables may be plugged in either way.
SVC 810 Tankless Troubleshooting Manual Error Code 03 (MIC-180 & EZLink Only) Explanation: Manifold Control Failure. The unit has lost the communications link between itself and the MIC-180; or between the two units with EZLink. At a minimum check the following: 1. Verify the communications cable is plugged into the printed circuit boards on the water heaters and the MIC-180. 2. Verify #4 Dip Switch is in the ON position for each water heater in the manifold. Turn power off.
SVC 810 Tankless Troubleshooting Manual 4. Press the SW3 button on the main communication PCB to change to trial operation mode. The left two digits of the LED display will indicate the water heater selected and will illuminate continuously. At the same time, the LED lamp on the main communication PCB or the extended communication PCB corresponding to the water heater selected will illuminate and indicate the water heater is in trial operation mode. 5. Open the hot water outlet.
SVC 810 Tankless Troubleshooting Manual 5. Select the type of maintenance by depressing SW2 (Group Number) and/or SW3 (Item Number) 6. The initial maintenance item is displayed on the two right digits on the display unit flashing between [Maintenance address – E1] and [Maintenance Data – the first error code]. 7. If the number of combustion, combustion time is 0, then [- -] will be displayed on the two right digits on the display unit. 8.
SVC 810 Tankless Troubleshooting Manual Troubleshooting • When measuring resistance of a part, turn off the electric power and be sure to disconnect the part completely before measuring (from connector or terminal). Resistance checks are performed on the part while it is disconnected from the control board. • Electrical checks are performed with the connectors in place and the unit turned on.
SVC 810 Tankless Troubleshooting Manual Unit Will Not Power On Explanation: Nothing happens when water is flowing through unit. At a minimum check the following in all cases: 1. Make sure unit is connected to proper 3 prong, grounded power supply and circuit breakers are on. 2. Clean cold inlet water supply filter. Ensure you have at least the minimum flow rate required to fire unit. Turn on several fixtures to make sure. 3. On new installations ensure hot and cold water lines are not crossed.
SVC 810 Tankless Troubleshooting Manual Is there voltage thru the 3 amp fuses? No Check fused power leads next to junction box. Check and verify the fused leads next to the junction box on the black and white wires are OK. Replace with 3 amp fuses if needed.
SVC 810 Tankless Troubleshooting Manual Did the unit go to main burner? No Disconnect all remote controls from the PCB and attempt to restart the unit. Yes Unit appears to be OK. No Did the unit go to main burner? OK - If you gone this far, there is one more thing to check. The pick-up sensor in the water flow control may be bad; or the board may be bad. Try this test: Check connector S between the Red and Black. With the unit ON and no water flow, you should be 11-15 DC volts.
SVC 810 Tankless Troubleshooting Manual Error Code 00 Explanation: One Hour continuous combustion timer is activated. Unit has a 60 minute time that will shut off the main burner if used in excess of one hour. Cold water will continue to flow thru the unit. (First generation products only – manufacture date thru Jul 06; models manufactured after August 2006 do not have a 60 minute timer.) Was the unit used continuously for more than one hour? No Unit appears to be OK. Try to restart.
SVC 810 Tankless Troubleshooting Manual Warning Code 10 Explanation: This is a warning code. Fan Motor is not creating enough ventilation. The venting system passed pre-purge, but has failed during normal operation. At a minimum check the following: 1. Check for blockage of heat exchanger fins. 2. Check heat exchanger flapper valve at vent connection of water heater moves freely. 3. Clean air intake filter. 4. Remove all obstructions.
SVC 810 Tankless Troubleshooting Manual Scenario 2 – Error Code 11; fan is operating; igniter does spark; main burner does not ignite.
SVC 810 Tankless Troubleshooting Manual Does the P.G.F.R. valve have a voltage? No Replace Printed Circuit Board Measure the voltage of connector R between Black#2 and Red#1 wires: 1.5 to 14 VDC Yes Is the resistance of the Gas Inlet Solenoid Valve OK? No Replace Gas Control Assy Measure the resistance of connector K between Black and Yellow wires: 0.8 to 2.
SVC 810 Tankless Troubleshooting Manual Is the resistance of the Proportional Gas Control Valve OK? No Replace Gas Control Assy Measure the resistance of connector R between Black#2 and Red#1 wires: 40 to 80 Ohms Yes Check or replace main burner Scenario 3 – Error Code 11; main burner ignites, but shuts off after ignition.
SVC 810 Tankless Troubleshooting Manual Error Code 12 Explanation: Flame Failure. Unit went to main burner for a period of time; but has since lost flame or the ability to verify the presence of flame. At a minimum check the following in all cases: 1. Bleed all air from gas lines. 2. Ensure appliance is properly grounded. 3. Ensure gas line, meter, and regulator are sized properly. 4. Ensure gas type and gas pressure to the machine is correct. 5.
SVC 810 Tankless Troubleshooting Manual Error Code 13 Explanation: Oxygen Depletion Sensor activated. The unit was not able to resolve an imperfect combustion issue. At a minimum check the following in all cases: 1. Check for lack of fresh combustion air such as in a tight closet. 2. Check maintenance history to see if this is the first incidence of failure with this code.
SVC 810 Tankless Troubleshooting Manual g. If within 3 minutes, you get any reading, and then the reading drops below 8 mv, and then goes to Ø, then we have a problem with the ODS, a missing sensor damper or the burner itself. Replace the burner assembly. What is the big different between normal error code 13 and no SD (Sensor Damper)? Normally error code 13 is just low voltage or frequency; it means the ODS is still sensing a burner flame.
SVC 810 Tankless Troubleshooting Manual Error Code 15 Explanation: Boiling Safety Device. The heat exchanger is too hot. At a minimum check the following: 1. Check for restrictions in airflow around unit and vent terminal. 2. Check for a foreign materials in exhaust venting. 3. Back flush the unit to remote any sediment of buildup in the heat exchanger. See section on how to display maintenance information. Display maintenance information line [4y] Heat Exchanger Thermistor temperature.
SVC 810 Tankless Troubleshooting Manual Error Code 16 Explanation: Outlet water temperature is to hot. The outlet water temperature is above set point on the remote control. The unit cannot resolve the issue with the cold-water by-pass function. Display maintenance information line [5y] Hot Water Outlet Thermistor temperature. Does the maintenance information indicate the hot water outlet temp? No Is the resistance to the hot outlet thermistor OK? Yes Yes The water heater appears to be normal.
SVC 810 Tankless Troubleshooting Manual Error Code 24 Explanation: Malfunction of Operational Switch. At a minimum check the following: 1. Disconnect remote control and retry. 2. Verify unit is electrically grounded. Do not use a 2 prong electrical adapter on the power cord. 3. Press MAX (SW2) button on PCB to reset. 4. Press MIN (SW1) button on PCB to reset. 5. Check for presence of return circulation pump in the system. Any water flowing thru the unit prior to turning unit ON may cause error code 24.
SVC 810 Tankless Troubleshooting Manual Error Code 31 Explanation: Water Inlet Thermistor has malfunctioned. At a minimum check the following if you get Error Codes 31, 32, 33, & 34: 1. Check for scale build up on the inlet filter screen. This scale build up could also happen inside the machine. Scale build up on all thermistors will cause them to be inaccurate. 2. IF maintenance mode shows 32 degrees as the temperature, then the thermistor is not making connection.
SVC 810 Tankless Troubleshooting Manual Error Code 33 Explanation: Hot Water Outlet Thermistor has malfunctioned. At a minimum check the following if you get Error Codes 31, 32, 33, & 34: 1. Check for scale build up on the inlet filter screen. This scale build up could also happen inside the machine. Scale build up on all thermistors will cause them to be inaccurate. 2. IF maintenance mode shows 32 degrees as the temperature, then the thermistor is not making connection.
SVC 810 Tankless Troubleshooting Manual Error Code 35 Explanation: Improper Thermistor Connections. Check to make sure that all thermistor connections are good and in the proper locations. There are four thermistors on the tankless unit. They are the ambient air thermistor, cold water inlet, hot water outlet and heat exchanger thermistor. At a minimum check the following: 1. Check thermistor wiring and Molex connections. 2. Check and clean ambient air temperature thermistor. 3.
SVC 810 Tankless Troubleshooting Manual Flame Rod Status (Flame Rod #3 for 74 Series Only) 0y 00 01 02 03 04 05 display Flame X O X O X O Rod 1 Flame X X O O X X Rod 2 Flame X X X X O O Rod 3 X=Not detecting flame O=is detecting flame Does the 0y display indicate any remaining flame? Yes No 06 07 X O O O O O The water heater seems to be normal. Try to operate again Pull out the relay connection of flame rod connectors (M), (L), (T) and then display maintenance information [0y].
SVC 810 Tankless Troubleshooting Manual Error Code 61 Explanation: Combustion Fan failure. Fan motor does not work properly. At a minimum check the following: 5. 6. 7. 8. Ensure fan motor will turn freely. Motor will operate with a small amount of restriction. Check there is some volume of air from the flue outlet at the top of the heater. Check wiring harness to motor for damaged and/or loose connections. Check Molex connections of the PCB.
SVC 810 Tankless Troubleshooting Manual Yes When motor operates, is the voltage to the water control OK? No Replace the Printed Circuit Board Measure the voltage at connector B between the White#2 and Black#8 wires for: 8 to 16 VDC Replace the Water Control Assembly Error Code 66 (RTG66 Only) Error Code 71 Explanation: Gas Inlet Solenoid Valve (G.I.S.V) fault. Check gas inlet solenoid valve wiring harnesses for loose or damage terminals; and connection K to the circuit board is tight.
SVC 810 Tankless Troubleshooting Manual Error Code 76 Explanation: Communication Fault with Remote Control. At a minimum check the following: 1. Check remote control wiring for loose or damaged connections. 2. Bypass remote control cable by connecting remote control directly to remote control terminals on PCB. Replace cable if found to be faulty. Remove remote control wires from wiring terminal on the PCB. Plug unit in and open a hot water source.
SVC 810 Tankless Troubleshooting Manual 5. If the unit does not operate on initial installation or after replacement of the PCB, then the circuit board requires programming with the fuel type and altitude chip. WARNING: When replacing High Altitude Connector, turn off the electric power to water heater. Pull out the power cord to disconnect electricity. Reconnect power cord.
SVC 810 Tankless Troubleshooting Manual Error Code 99 Explanation: Fan Motor is not creating enough ventilation. The venting system passed pre-purge, but has failed during normal operation. At a minimum check the following: 1. Check for blockage of heat exchanger fins 2. Check heat exchanger flapper valve at vent connection of water heater moves freely. 3. Clean air intake filter. 4. Remove all obstructions.
SVC 810 Tankless Troubleshooting Manual Warning Code P1 Explanation: Water flow rate is less than minimum for main burner ignition. The unit must have .66 gallons per minute before the main burner will light or sustain burner. When water flow does not reach minimum flow rate for five seconds the warning code is displayed. This warning code was introduced in September of 2007. At a minimum check the following: 1. 2. Check cold water inlet screen for debris. Check aerator screens of fixture for debris.
SVC 810 Tankless Troubleshooting Manual 2. Air Filter Switch a. Remove the single screw closest to white Molex connector. b. Remove Molex if replacing air filter switch. 3. Water Inlet Solenoid; Cold Water Connection; Cold Water Inlet Thermistor d. Step 1 and e. Remove four screws on the cold water inlet connector (outside bottom of unit). f. Note the connector has a rubber o-ring and metal gasket to seal the connection. g. Remove two spring clips on cold water bypass pipes. h.
SVC 810 Tankless Troubleshooting Manual 4. Hot Water Outlet Connector and Thermistor a. Step 1 and 3 plus b. Remove electrical connection box (single screw on outside left). c. Remove one ceramic heater plug. d. Remove outlet pipe bracket and ceramic heater plug. e. Remove three screws on hot water outlet connector (outside bottom of unit). f. Gently pull outlet pipe from connector and move to one side. g. Unscrew and remove drain valve. h. Rotate and remove hot water outlet thermistor from the unit. i.
SVC 810 Tankless Troubleshooting Manual 5 Fan Assembly a. Step 1 and b. Clip plastic tie holding Ambient Air Thermistor. c. Disconnect Fan Assembly Molex. d. Loosen wire clip holding the wire bunch in place. e. Remove three screws (one outside bottom; one inside back left; one inside back right).
SVC 810 Tankless Troubleshooting Manual 6 Proportional Gas Flow Regulator (Gas Valve) a. Step1 and b. At the gas valve, remove the three retains clips and screws from each of the gas manifold tubes. Note the brass colored tube has a special clip; the silver colored tubes have a different clip. c. On the burner plate cover, remove the two retaining clips and crews from the manifold supply tubes. d. Note that each manifold tube has a rubber o-ring on each end to seal the tube. e.
SVC 810 Tankless Troubleshooting Manual 7. Burner Plate Cover a. On the burner plate cover, remove the two retaining clips and crews from the manifold supply tubes. b. At the gas valve, remove the three retains clips and screws from each of the gas manifold tubes. Note the brass colored tube has a special clip; the silver colored tubes have a different clip. c. Note that each manifold tube has a rubber o-ring on each end to seal the tube. d. Remove the two screws that hold the igniter mounting plate. e.
SVC 810 Tankless Troubleshooting Manual 8 Igniter and Igniter Probes a. Step 7 and b. Remove the two screws that hold the right hand ceramic igniter probe (black wire) on the burner chassis. c. Remove the two screws that hold the left hand ceramic igniter probe (black wire) on the burner chassis. d. Remove the igniters. e. Remove the igniter wires from the end of the ceramic probes. f. Reseat black rubber plugs to prevent wires from pinching on metal. 9 Flame Rod(s) a. Step 7 and 8 and b.
SVC 810 Tankless Troubleshooting Manual Parts Below are the most common replacement parts. For a complete list of all replacement parts, please see the most current parts catalog. Part Water Flow Inlet Valve Description Cold water inlet valve that measures water temperature and detects flow in gallons per minute Oxygen Depletion Sensing Device (indoor models only) Safety device that detects improper combustion (fuel-air mixture) and attempts to fix it Proportional Gas Flow Regulator Valve (P.G.R.F.
SVC 810 Tankless Troubleshooting Manual Flame Rods Safety device that detects the presence of flame Igniter Spark igniter that lights the main burner Thermistor(s) A thermistor is an electronic thermostat. There are four of them: cold water inlet, hot water outlet, heat exchanger and ambient air. Shown is the cold water inlet thermistor. Valve that delivers the hot water to the piping system and measure the hot water outlet temperature with the aid of a thermistor.
SVC 810 Tankless Troubleshooting Manual Remote Control Digital control panel that allows user to adjust temperature, monitor status of the machine and review certain maintenance functions Air Filter Assembly Inlet air filter (indoor models only) that keeps out lint and dust from inside the machine Fan Assembly Fan (blower motor) that draws fresh air into the machine and mixes it with the fuel for burning in the combustion chamber Burner Assembly Burner component that ignites the fuel-air mixture and
SVC 810 Tankless Troubleshooting Manual Parts Exploded View for RTG2-42PV and RTG 53PV Ref # 1 2 3 4 5 6 7 8 Description Control Board Control Board Fuse (5A) Power Line Fuse (3A) Program Chip Gas Valve Burner Assembly Flame Rod Ignitor Electrode Flame Rod Wire Ignitor Coil Fan Assembly 9 10 11 13 N/S** N/S** *PV = Power Vent (not Direct Vent) ** N/S = Not Shown 74 Burner Manifold Gas Inlet Connector Water Control Valve Inlet Thermistor -White Water Inlet Connector 3/4 Inlet Water Filter Hot Outl
SVC 810 Tankless Troubleshooting Manual Parts Exploded View for RTG 53X Ref # 1 2 3 4 5 6 7 8 Description Control Board Control Board Fuse (5A) Power Line Fuse (3A) Program Chip Gas Valve Burner Assembly Flame Rod Flame Rod Wire Igniter Electrode Ignitor Coil Fan Assembly 9 10 11 N/S** N/S** * X = Outdoor Model ** N/S = Not Shown 75 Burner Manifold Gas Inlet Connector 3/4 Water Control Valve Inlet Thermistor -White Water Inlet Connector 3/4 Inlet Water Filter Hot Outlet Connector 3/4 Outlet Therm
SVC 810 Tankless Troubleshooting Manual Parts Exploded View for RTG 53DV Ref # 1 2 3 4 5 6 7 8 Description Control Board Control Board Fuse (5A) Power Line Fuse (3A) Program Chip Gas Valve Burner Assembly Flame Rod Flame Rod Wire Igniter Electrode Ignitor Coil Fan Assembly 9 10 11 N/S** N/S** * DV = Indoor Direct Vent Model ** N/S = Not Shown 76 Burner Manifold Gas Inlet Connector 3/4 Water Control Valve Inlet Thermistor -White Water Inlet Connector 3/4 Inlet Water Filter Hot Outlet Connector 3/4
SVC 810 Tankless Troubleshooting Manual Parts Exploded View for RTG 66DV Ref # 1 2 2 7 3 6 6 4 Description Control Board Control Board Fuse (5A) Power Line Fuse (3A) Heat Exchanger Thermistor - Yellow Ambient Thermistor - Blue Inlet Thermistor - White Outlet Thermistor - Black Gas Valve - LP Gas Valve - NAT Gas Control Resistor Gas Inlet Connector 3/4 Burner Assembly Burner Manifold - LP Burner Manifold - NAT Sensor Orfice - LP 4 5 8 8a 9 14 10 11 Sensor Orifice - NAT Ignitor Coil Ignitor Electrode
SVC 810 Tankless Troubleshooting Manual Parts Exploded View for RTG 74PV and GT 199PV Ref # N/S** 1 2 3 4 5 6 7 8 Description Transformer (120v to 100v) 1st Generation only Control Board Control Board Fuse (5A) Power Line Fuse (3A) Program Chip Gas Valve Burner Assembly Ignitor Electrode Flame Rod Flame Rod Wire Ignitor Coil Fan Assembly Burner Supply Tubes 9 10 11 12 13 N/S** N/S** * PV=Indoor Power Vent Model ** N/S = Not Shown 78 Gas Inlet Connector 3/4 Water Control Valve Inlet Thermistor -Whi
SVC 810 Tankless Troubleshooting Manual Parts Exploded View for RTG 74DV and GT 199DV Ref # N/S** 1 2 3 4 5 6 7 8 Description Transformer (120v to 100v) 1st Generation only Control Board Control Board Fuse (5A) Power Line Fuse (3A) Program Chip Gas Valve Burner Assembly Ignitor Electrode Flame Rod Flame Rod Wire Ignitor Coil Fan Assembly Burner Supply Tubes 9 10 11 12 13 N/S** N/S** * DV=Indoor Direct Vent Model ** N/S = Not Shown 79 Gas Inlet Connector 3/4 Water Control Valve Inlet Thermistor -Wh
SVC 810 Tankless Troubleshooting Manual Parts Exploded View for RTG 74X and GT 199X Ref # N/S** 1 2 3 4 5 6 7 8 Description Transformer (120v to 100v) 1st Generation only Control Board Control Board Fuse (5A) Power Line Fuse (3A) Program Chip Gas Valve Burner Assembly Ignitor Electrode Flame Rod Flame Rod Wire Ignitor Coil Fan Assembly Burner Supply Tubes 9 10 11 12 13 N/S** N/S** * X =Outdoor Model ** N/S = Not Shown 80 Gas Inlet Connector 3/4 Water Control Valve Inlet Thermistor -White Water Inl
Rheem® Water Heating Ruud® Water Heating 1241 Carwood Court Montgomery, AL 36117 1-800-432-8373 www.rheemtankless.com Printed in the U.S. 08/08 Form No.
