Service Handbook Commercial / Residential gas water heater FOR MODELS: BTX 100, GDHE 50 SERIES 120 & 121 500 Tennessee Waltz Parkway Ashland City, TN 37015 INSTALLATION CONSIDERATIONS - PRE SERVICE CHECKS - WATER HEATER CONSTRUCTION OPERATION & SERVICE - TROUBLESHOOTING Servicing should only be performed by a Qualified Service Agent PRINTED IN THE U.S.A.
Table Of Contents Table Of Contents �������������������������������������������������������������������������� 1 Control System Hardware ��������������������������������������������������������� 37 Introduction ������������������������������������������������������������������������������������ 2 UIM (User Interface Module) ����������������������������������������������� 37 Qualifications ������������������������������������������������������������������������������������� 2 CCB (Central Control Board)
Introduction This Service Manual covers the water heater Model and Series numbers listed on the front cover only. The instructions and illustrations contained in this manual will provide you with troubleshooting procedures to verify proper operation and diagnose and repair common service problems. Qualifications Qualified Installer or Service Agency Installation and service of this water heater requires ability equivalent to that of a Qualified Agency (as defined by ANSI below) in the field involved.
Installation Considerations This section of the Service Manual covers some of the critical installation requirements that, when overlooked, often result in operational problems, down time and needless parts replacement. Costs to correct installation errors are not covered under the limited warranty. Ensure all installation requirements and instructions contained in the Instruction Manual that came with the water heater have been followed prior to performing any service procedures.
Venting This section of the Service Manual is not a complete venting installation instruction. Refer to the Instruction Manual that came with the water heater; ensure the venting has been installed per all Instruction Manual requirements. Costs to correct installation errors are not covered under the limited warranty.
Factory Supplied/Installed Fittings Factory supplied vent and intake air terminations and factory installed fittings on the water heater are not factored in to the vent and intake air pipe equivalent feet calculations. The intake air connection fitting and exhaust elbow (vent connection) are factory installed fittings, see Figure 1 below and Figure 3 on page 8. Intake Air Connection The intake air connection has a screen and a hose barb installed at the factory, see Figure 1 below.
Electrical Requirements The water heaters covered in this manual require a 120 VAC (Volts Alternating Current) 1Ø (Single Phase) power supply. The maximum AC amperage is approximately 5.2 FLA (full load amps) during the Igniter Warm Up operating state. Residential models are factory equipped with a 3 prong appliance cord that plugs into a standard 120 VAC wall outlet.
Installation Check List The list below represents some of the most critical installation requirements that, when overlooked, often result in operational problems, down time and needless parts replacement. Before performing any troubleshooting procedures use the list below to check for installation errors. Costs to correct installation errors are not covered under the limited warranty.
Features And Components Front & Back Views FRONT VIEW BACK VIEW 2 INCH PVC INTAKE AIR CONNECTION TOP COVER ON / OFF SWITCH HEATING LOOP SUPPLY LINE CONNECTION 3/4 INCH NPT UIM (user interface module) CONTROL INTERFACE COVER. TEMPERATURE PROBE - LOCATED BEHIND CONTROL INTERFACE COVER TEMPERATURE PRESSURE RELIEF VALVE BLOCKED EXHAUST SWITCH SENSING TUBE TANK GLASSING PLUG COVER. USED FOR MANUFACTURING PURPOSES ONLY. DO NOT REMOVE GLASSING PLUG FOR ANY SERVICE OR MAINTENANCE.
Top View SECOND ANODE ROD 1/2 INCH SUPPLY GAS CONNECTION BLOCKED INTAKE AIR SWITCH 2 INCH PVC INTAKE AIR CONNECTION COMBUSTION BLOWER 2 INCH PVC VENT CONNECTION JUNCTION BOX - 120 VAC POWER SUPPLY CONNECTIONS BLOCKED EXHAUST SWITCH BLOWER PROVER SWITCH 3/4 INCH NPT WATER INLET 3/4 INCH NPT WATER OUTLET WITH OUTLET ANODE ROD BURNER SIGHT GLASS TEMPERATURE PRESSURE RELIEF VALVE CCB ENCLOSURE (central control board) FRONT Figure 4 Combustion Blower & Burner Assembly COMBUSTION BLOWER EXPLODED VI
Operation and Service How It Works This section of the manual will cover operation, common service procedures and water heater construction. The water heater covered in this manual has a helical shaped coil heat exchanger that is submerged in the storage tank. These water heaters use a top mounted down fired radial design Burner.
Combustion Blower The Combustion Blower is an assembly that includes the blower housing, blower motor and an electronic speed control. The Combustion Blower is controlled by the CCB (Central Control Board), see Control System Hardware on page 37. The CCB sends 120 VAC from the J2 socket on the CCB circuit board to a 3 pin wiring socket on the blower assembly, see CCB Circuit Board Layout on page 41 and Figure 7 below.
Burner Assembly The Burner is a radial design burner with a steel fiber jacket on the outer surface and is part of a larger Burner Assembly. Figure 8 and Figure 9 below show side views of the complete Burner Assembly removed from the water heater with key components identified. See the exploded view of the Combustion Blower & Burner Assembly on page 9 also.
BURNER ADAPTER WIRING HARNESS IGNITER/FLAME SENSOR BURNER GROUND WIRE BURNER ADAPTER BLOWER FLANGE WITH BLOWER DISCHARGE ORIFICE IN PLACE Figure 10 BURNER SIGHT GLASS BLOWER DISCHARGE ORIFICE BURNER ADAPTER WIRING HARNESS IGNITER/FLAME SENSOR BLOWER FLANGE WITH ORIFICE REMOVED Figure 11 BURNER ADAPTER WIRING HARNESS IGNITER/FLAME SENSOR BLOWER FLANGE WIRING HARNESS GROMMET BLOWER DISCHARGE ORIFICE BURNER ADAPTER Figure 12 Servicing should only be performed by a Qualified Service Agent 13
Combustion Blower and Burner Removal The Combustion Blower and Burner Assembly must be removed to inspect the Burner and to service the Flame Sensor and Igniter. This section will provide instructions on how to remove and inspect these components. Service Notes: • There are four 1/8 inch hex head machine screws that hold the Combustion Blower to the Blower Flange on the Burner Adapter.
6. Disconnect the 24 Volt power wires to the 24 Volt Gas Valve at the two spade connectors in the wiring harness to the valve, see Figure 14 below. 7. Disconnect the Blower Prover switch sensing tube from the Combustion Blower outlet sensing port, see Figure 14 below. 8. Turn off the supply gas to the water heater at the main gas shutoff valve serving the water heater. 9. Disconnect the supply gas line to the water heater at the water heater's 24 Volt Gas Valve. 10.
Figure 15 Burner Assembly Removal 1. Follow the instructions to remove the Combustion Blower beginning on page 14. 2. Remove the Blower Discharge Orifice from the top of the Burner Adapter. 3. Unplug the Burner Adapter wiring harness; three male/female spade connections for the Igniter and Flame Sensor behind the CCB enclosure, see Figure 10 on page 13. 4.
Burner Assembly Installation 17. To re-install the Burner Assembly follow the steps for removal in reverse order. 18. Install a new white fiber gasket between the Burner Adapter and the Heat Exchanger Flange on top of the water heater. Install a new white fiber gasket between the Burner and the Burner Adapter also. See Figure 5 on page 9. 19.
Flame Sensor Ignition of the Burner is controlled electronically. The principle of operation for electronic ignition relies on flame sensing current to prove the fuel gas flowing to the Burner has been ignited and is burning safely. Flame sensing requires correct power supply polarity and an adequate earth ground to the water heater's Burner, see Electrical Requirements and the Power Supply Test on page 6. See Figure 16 on page 17 for the Burner ground wire location.
Flame Sensing Current Test During the heating cycle the flame sensing current is normally between 8.0 μA and 12.0 μA with a clean Flame Sensor. Over time the Flame Sensor will accumulate corrosion (rust) and this will reduce flame sensing current. With heavier use, more heating cycles/greater load, corrosion will occur more quickly. Measuring flame sensing current requires a test meter with a DC micro amp function, see Tools Required on page 2. The meter’s selector is set to DC micro amps.
Igniter The water heaters covered by this manual use a hot surface igniter (HSI). The Igniter is made of a ceramic composite material, see Figure 20 below. The Control System powers the Igniter (120 VAC) from the J5 Socket on the CCB. The Control System monitors amperage through the Igniter to ensure it is hot enough to ignite the fuel gas flowing to the Burner during ignition.
IGNITER CURRENT TEST AT J5 SOCKET ON CCB IGNITER CURRENT TEST BEHIND CCB ENCLOSURE Figure 21 Service Notes: • The animated lighting bolt Status Icon is visible on the LCD Desktop Screen during the Igniter warm up operating state. See Desktop Screen on page 46 and Status Icons on page 47. • As a visual confirmation that minimum Igniter current is present the Control System will display a check mark next to the lighting bolt icon on the Desktop Screen during the Igniter Warm Up operating state.
Venturi A Venturi is mounted on the inlet of the Combustion Blower. All combustion air flows through the Venturi. The outlet of the 24 Volt Gas Valve connects directly to the side of the Venturi. Fuel gas flows from the outlet of the 24 Volt Gas Valve into the side of the Venturi directly. Inside the Venturi there is a cone shaped restrictor that constricts the air passage to the Combustion Blower inlet. As air enters the constriction point it’s velocity increases.
Gas Valve The 24 Volt Gas Valve on these water heaters is DC voltage valve. The CCB sends 24 VAC to the valve and the AC voltage is rectified into a DC voltage by electronics contained inside the plug end of the 24 Volt Gas Valve wiring harness, see Figure 23 below. 24 VOLT GAS VALVE ASSEMBLY TOP VIEW 24 VOLT GAS VALVE WIRING HARNESS PLUG. 24 VAC FROM CCB IS RECTIFIED TO 24 VDC BY ELECTRONICS INSIDE THE PLUG END.
Gas Valve Removal The outlet of the 24 Volt Gas Valve is connected by flange directly to the side of the Venturi and is secured by three - 5/32” hex head screws. A gas orifice with gasket is fitted into the gas valve’s outlet flange, see Figure 25 and Figure 26 below. The 24 Volt Gas Valve must be removed to inspect the gas orifice. Ensure there is a new gasket on hand before removing the valve. Call the toll free phone number on the back cover of this manual to order parts.
Gas Pressure The water heater covered in this Service Manual is rated at 100,000 Btu/hr input. It is certified for elevations up to 10,100 feet (3,078 meters). For higher elevations call the toll free support phone number shown on the back cover of this manual for technical assistance. Table 2 †Manifold Offset Pressure NATURAL GAS 0.24” W. C. (0.056 kPa) PROPANE GAS 0.17” W. C. (0.042 kPa) Minimum Supply Pressure NATURAL GAS PROPANE GAS 3.5” W. C. (0.87 kPa) 8” W. C. (1.
Gas Pressure Test 1. If the water heater is in a heating cycle lower the Operating Set Point to end the cycle, see Temperatures on page 49. 2. Turn off power to the water heater at the water heater's on/off switch. 3. Turn off the supply gas to the water heater at the main gas shutoff valve serving the water heater. 4. Open the manifold offset and supply gas pressure test ports on the 24 Volt Gas Valve, see Figure 28 below.
Gas Flow Test The following illustrations show the approximate pressures for the manifold offset and supply gas for the Standby, Pre-Purge and Heating operating states during a normal heating sequence. Notice how the manifold offset pressure starts at 0" W.C. in the Standby operating state, falls to a deep vacuum during the Pre-Purge state and then rises to a slight positive pressure when the 24 Volt Gas Valve is energized during the Heating state.
Pressure Switches The water heaters covered in this manual are factory equipped with three pressure switches. Figure 4 on page 9 shows the location of the three pressures switches on top of the water heater. This section of the manual covers pressure switch construction, operation and the test procedures used to diagnose operational problems associated with pressure switches.
Control System Monitoring The Control System monitors the “state” of the pressure switch contacts individually through three separate circuits, see Wiring Diagram on page 44. The state of the switch refers to whether the switch contacts are open or closed, see Construction & Operation on page 28. At the beginning of a heating sequence, before the Combustion Blower is energized, the Control System enters the Input Verification operating state, see Operating States on page 48.
Sensing Tubes The three pressure switches monitor pressure through plastic sensing tubes from three different sensing ports on the water heater, see Figure 32 below. The Blower Prover switch monitors pressure from the Combustion Blower's outlet, see Figure 14 on page 15. The Blocked Intake Air switch monitors pressure from the Combustion Blower’s intake air connection fitting, see Figure 1 on page 5.
Pressure Switch Tests Complete pressure switch testing involves three procedures: • Continuity Test During Standby below. • Continuity Test During Operation on page 32. • Pressure Test During Operation on page 32. Continuity Test During Standby This test is performed while the Combustion Blower is not running with the water heater turned off. This is a "normal state" continuity test of the contacts inside each pressure switch. Disconnect the two wires to each pressure switch for this test. 1.
Continuity Test During Operation This test is performed while the Combustion Blower is running at high speed during the Pre-Purge operating state. The test is performed on all three pressure switches. Disconnect the two wires to each pressure switch - one at a time, check continuity and then reconnect the wires to that switch before testing the next switch. 1. Ensure power to the water heater is turned off at the water heater's on/off switch. 2.
Table 3 †Activation Pressure Tolerance Blower Prover +0.75" W.C. ± 0.05" W.C. Blocked Intake Air -2.00" W.C. ± 0.05" W.C. Blocked Exhaust +2.00" W.C. ± 0.05" W.C. †Though it is uncommon, pressure switch specifications can be changed by the manufacturer. These activation pressures are current as of the (month/year - expressed as MM/YY) date code printed on the front cover of this manual in the lower left corner.
BLOWER PROVER SWITCH PRESSURE TEST BLOCKED INTAKE AIR SWITCH PRESSURE TEST BLOCKED EXHAUST SWITCH PRESSURE TEST Figure 34 34 Servicing should only be performed by a Qualified Service Agent
Temperature Probe This section of the manual provides information on the Temperature Probe, see Figure 3 on page 8 for location. The Temperature Probe contains the ECO (energy cut out) and a Temperature Sensor. The Temperature Probe connects to the J7 Socket on the CCB, see CCB Circuit Board Layout on page 41 and CCB Connection Identification on page 42.
Table 4 WATER TEMPERATURE Celsius Fahrenheit Temperature sensor RESISTANCE IN OHMS 3° 40° 26,435 21° 70° 11,974 38° 100° 5,862 49° 120° 3,780 55° 130° 3,066 60° 140° 2,503 71° 160° 1,698 82° 180° 1,177 ECO Continuity Test 1. Turn off power to the water heater at the water heater's on/off switch. 2. Remove the top cover on the water heater, see Figure 3 on page 8. 3. Disconnect the four pin plug from the Temperature Probe outside the CCB enclosure on the left, see Figure 35 below.
Control System Hardware This section of the manual will provide information on Control System hardware , operation and service procedures. See Control System Operation on page 45 for information on Control System features, navigation, menus, and user settings. The water heaters covered in this manual are equipped with an electronic Control System that regulates water temperature inside the storage tank. Heating cycles and ignition are managed by the Control System.
UIM Ribbon Cable Connection Service Notes: The Ribbon Cable that connects the Button Pad Overlay to the UIM Circuit Board must be plugged in exactly as shown in Figure 36 on page 37. The metal crimp connections in the Ribbon Cable plug must be facing away from the UIM circuit board. These metal crimp connections are only visible on one side of the plug, see Figure 37 below. There are six flat metal pins on the UIM circuit board J3 socket.
CCB (Central Control Board) The CCB is a printed circuit board mounted inside a protective plastic enclosure, see Figure 38 and Figure 39 below. The CCB circuit board is the main control. All instructions for ignition and temperature control originate from this circuit board. Diagnostic and operational messages are generated by the CCB and sent to the UIM, see UIM (User Interface Module) on page 37.
CCB Cover Removal And Replacement The cover on the CCB enclosure must be removed for various service procedures outlined in this manual. Refer to the instructions on page 40 when removing and replacing the CCB cover. Wiring to and from the CCB and other water heater components enters the CCB enclosure on the left side. Strain relief for the wiring is provided between the enclosure's front cover and the internal transformer cover.
CCB Circuit Board Layout CCB (CENTRAL CONTROL BOARD) 1 1 1 2 2 2 1 3 3 4 2 4 4 5 J2 J3 J1 J4 J5 J6 Type Tstat Spare Retries OPEN Yes 2 3 4 Use 1 1 Retry Ext Input 3 No 15 12 9 6 3 14 11 8 5 2 13 10 7 4 1 Vent Spare J7 S1 DIPSWITCH 4 3 2 1 J9 J13 J10 1 5 1 3 2 6 J15 2 4 3 7 1 4 8 2 J16 J11 Use Yes Type Tstat Spare OPEN Ext Input 3 Retries 1 1 Retry 2 3 4 S1 DIPSWITCH DETAIL No Vent Spare Dipswitch Operation: Along one side o
CCB Connection Identification J1 Socket - Transformer Pin # 1 2 3 4 5 Description 120 VAC hot to transformer Not used 120 VAC neutral to transformer 24 VAC out from transformer 24 VAC out from transformer J2 Socket - 120 VAC To Combustion Blower Pin # 1 2 3 4 Description 120 VAC hot to Combustion Blower 3 pin socket, see Figure 7 on page 11 120 VAC neutral to Combustion Blower 3 pin socket, see Figure 7 on page 11 Not used Not used J3 Socket - 120 VAC Power Supply Pin # 1 2 3 Description 120 VAC
CCB Connection Identification (Cont) J7 Socket - Temperature Probe/ECO (immersion probe) Pin # 1 2 3 4 Description ECO (energy cut out) 24 VAC out (red wire) Temperature Sensor (thermistor) +5.0 VDC (black wire) Temperature Sensor (thermistor) -5.
Wiring Diagram 24 VOLT GAS VALVE BLOWER PROVER BLOCKED EXHAUST J6 2 15 4 14 5 10 6 7 8 11 J5 J4 UIM J16 BLOCKED INTAKE AIR ENABLE/DISABLE CIRCUIT JUMPER WIRE BETWEEN PINS 8 AND 11 ON J6 PLUG HOT SURFACE IGNITER 1 BLACK 2 WHITE FLAME SENSOR RED 1 RED (ECO) 3 BLACK TEMPERATURE PROBE 4 RED (ECO) PWM (Pulse Width Modulation) SPEED INSTRUCTION SIGNAL WIRES FROM CCB TO BLOWER SPEED CONTROL 3 WHITE/GREEN NOTE: COMBUSTION BLOWER ASSEMBLY CONSISTS OF MOTOR, BLOWER AND INTEGRAL BLOWER SPEED CONTRO
Control System Operation Overview This section of the manual provides instructions and information on Control System features, navigation, menus, and user settings. See Control System Hardware on page 37 for information concerning the Control System hardware and components. The water heaters covered in this manual are equipped with an electronic Control System that controls all water heater functions.
Commercial And Residential Models The water heaters covered by this manual are produced for commercial and residential use. The Control System is programmed differently for commercial and residential models. There are two differences in Control System operation between the residential and commercial products: • Commercial models will display Tank Temperature on the Desktop Screen, residential models will not.
Status Icons The Status Icons are displayed on the Desktop Screen and convey operational and diagnostic information. The icons are described in the table below. Table 5 Icon Description Water temperature in the tank has fallen. Shaded area of the animated thermometer icon will rise and fall in response to water temperature in the storage tank as sensed from the Temperature Probe(s). Water temperature in the tank has reached the Operating Set Point. The Control System enters the Standby operating state.
Operating States The current operating state of the water heater is displayed on the Desktop Screen as the "Status." The common operational states are described in the table below. Table 6 State Description Standby The water heater is not in an active heating cycle. IE: the Tank Temperature is at or above the Operating Set Point. Input Verification The Control System is conducting a diagnostic check at the beginning of a heating cycle.
Temperatures Operating Set Point And Differential Adjustment The Operating Set Point is adjustable from 90°F (42°C) to 180°F (82°C) for commercial and 160°F (71°C) on residential models. The factory setting is 120°F (49°C). The Differential is adjustable from 2° to 20°. The factory setting is 8°. When the water temperature sensed by the Control System from the Temperature Probe reaches the Operating Set Point the Control System will end the heating cycle.
Temperatures Menu Description/Action • Tank Temperature - non adjustable - Control System sensed temperature from the Temperature Probe. • Tank Probe Offset - adjustable user setting, range -5° to +5° (factory setting 0°). The Tank Probe Offset is used to calibrate Control System temperature sensing. This can improve the precision of temperature control in the storage tank and at points of use.
Display Settings Description/Action Display Select Display Settings from the Main Menu and press the Operational Button under "SELECT" to enter this menu. This menu contains adjustable display options for viewing information on the LCD screen. Use the Up & Down Buttons to navigate the menu. Display Settings • Temperature Units - Adjustable user setting that changes temperature units display to Celsius °C or Fahrenheit °F.
Current Fault Description/Action Display Select Current Fault from the Main Menu and press the Operational Button under "SELECT" to enter this menu. This menu contains non adjustable operational information. Use the Up & Down Buttons to navigate the menu. Blocked Exhaust Fault occurred 2 mins ago The exhaust is blocked or restricted. Ensure condensate hose is draining. This menu contains the current Fault or Alert error message. The time the Fault or Alert message occurred appears directly below.
Service Contact Information There is a discrete menu that Installing contractors and/or service agents can access to enter contact information for their customers. This contact information will be displayed with all Fault and Alert messages. Description/Action From the Desktop Screen press and hold down the middle (unmarked) Operational Button for 30 seconds and then release it. This will launch a discrete menu where personalized contact information can be entered.
Sequence Of Operation Read the Sequence of Operation below before attempting to diagnose or repair any operational problems. Refer to the Features And Components on page 8 for the location of various water heater components described below. See the Sequence Of Operation Flow Chart on page 55 also. 1. When the control system is first powered, during boot up, it will display manufacturer information and Control System software revisions.
Sequence Of Operation Flow Chart If tank temperature drops below Operating Set Point minus Differential setting a heating cycle is activated Control System performs diagnostic system check Normal State of all pressure switches and ECO are checked Blower Prover pressure is switch verified open All other pressure switches and ECO are verified closed NO Control System Locks Out Displays Fault Msg YES Combustion Blower is energized Pre-Purge cycle Blower Prover switch contacts confirmed closed by Control Sys
Troubleshooting The Control System performs exhaustive self diagnostics and displays detected fault conditions in plain English fault messages on the LCD when there is a problem. When the Control System declares a fault condition it will “lock out” and disable heating. Troubleshooting procedures for the most common fault conditions are covered in this manual. In the tables that follow the first column will show a list of things to check and repair for a given problem or fault condition.
Control System Unresponsive Displayed Message/Condition/Indicates UIM (LCD) Is Blank The LCD on the UIM is not showing any data. The water heater may be running and maintaining hot water or it may not be operational. Causes for this include: • • • • • • • • On/Off switch is turned off. Water heater is not plugged in. Tripped breaker - blown fuses. 120 VAC power supply problems. 24 VAC power supply problems. Defective transformer. Wiring or plug/socket connection problems.
Fault Messages Displayed Message/Condition/Indicates AC Reversed The Control System has detected the power supply polarity is reversed. AC Reversed Fault occurred 2 mins ago Power supply to water heater has reversed polarity. Call a service professional: Your Company Name Here (press [DOWN] for more....) CHANGE BACK ADVANCED Important Service Reminder: When performing any troubleshooting steps outlined in this manual always consider the wiring and connectors between components.
Fault Messages Displayed Message/Condition/Indicates Flame Sensor Short The Control System has detected the Flame Sensor is grounded. Flame Sensor Short Fault occurred 2 mins ago The flame sensor is grounded. Call a service professional: Your Company Name Here (press [DOWN] for more....) CHANGE BACK ADVANCED Possible Causes - Check/Repair • Check all wiring and plugs between the J4 spade connector on the CCB (page 41) and the Burner Adapter wiring harness behind the CCB enclosure.
Fault Messages Displayed Message/Condition/Indicates Possible Causes - Check/Repair Energy Cut Out (ECO) • Be extremely careful - record temperature from a nearby hot water fixture. • If recorded temperature is above 180°F - shut off power and gas to the water heater and call the toll free support phone number on the back cover of this manual for further assistance. Do not leave the water heater in operation under any circumstances.
Fault Messages Displayed Message/Condition/Indicates Blocked Air Intake The Control System has detected the Blocked Intake Air switch has open contacts - restricted combustion air intake to the water heater, inadequate supply of combustion air. Blocked Air Intake Fault occurred 2 mins ago The combustion air intake is restricted. Call a service professional: Your Company Name Here (press [DOWN] for more....
Fault Messages Displayed Message/Condition/Indicates Blocked Exhaust The control system has detected the Blocked Exhaust switch has open contacts - restricted/blocked vent piping, the water heater is not venting properly. Blocked Exhaust Fault occurred 2 mins ago The exhaust is blocked or restricted. Ensure condensate hose is draining. Call a service professional: Your Company Name Here (press [DOWN] for more....
Fault Messages Displayed Message/Condition/Indicates Blower Prover Open (Combustion Blower Not Running) The Control System has detected the Blower Prover switch has open contacts after the Combustion Blower has been energized. Blower Prover Open Fault occurred 2 mins ago The blower prover switch remains open after the blower has been energized. Call a service professional: Your Company Name Here (press [DOWN] for more....
Fault Messages Displayed Message/Condition/Indicates Possible Causes - Check/Repair Low Igniter Current • Check all wiring between CCB’s J5 Socket (page 41) pins 1 & 2 and the Igniter. Repair/replace anything worn or damaged as necessary. The Control System has detected less than 0.5 AC amps through the Igniter during the Igniter Warm Up operating state. See the Sequence Of Operation Flow Chart on page 55. Low Igniter Current Fault occurred 2 mins ago Igniter current is low.
Fault Messages Displayed Message/Condition/Indicates Ignition Failure • Ensure the main gas shut off valve is open. The Control System has detected less than 1.0 μA (DC micro amps) through the flame sensor during the Ignition Verification operating state on three consecutive trials for ignition. Ignition Failure Fault occurred 2 mins ago The water heater has failed to ignite the burner. Call a service professional: Your Company Name Here (press [DOWN] for more....
Fault Messages Displayed Message/Condition/Indicates Ignition Failure The Control System has detected less than 1.0 μA (DC micro amps) through the flame sensor during the Ignition Verification operating state on three consecutive trials for ignition. Ignition Failure Fault occurred 2 mins ago The water heater has failed to ignite the burner. Call a service professional: Your Company Name Here (press [DOWN] for more....
NOTES
NOTES
500 Tennessee Waltz Parkway, Ashland City, TN 37015 Technical Support: 800-527-1953 • Parts: 800-433-2545 • Fax: 800-644-9306 www.hotwater.
