Installation / Operation Instruction Manual

58
Troubleshooting
RTG-L-199/160N/X1 – 6 721 827 274 (2022/06)
before proceeding to the next. The suggested solutions may
require that the cover be taken off. (See fig. 3, page 12).
8.2 Burner does not ignite when hot water is
turned ON
It is recommended to use “P4 Information” page 48, chapter
6.5.1 as a tool for problem solving.
1. If the display is blank, verify power to outlet. (120VAC/
60Hz properly grounded circuit required). Verify the heater
power supply. Check all wire connections including
plugged connectors.
2. With the power supply OFF and the power supply cord
unplugged, remove the unit's front cover (See fig. 3,
page 12). Check wire connections between the water
valve, control unit and electrode set. See Fig. 62, page 69.
3. Verify the fuses in the control board are good. To access
fuses, the control board must be removed. See section 5.2,
page 45.
4. Make sure cold water inlet connection is plumbed to the
right side of heater when facing unit. See Fig. 28, page 38.
5. A minimum of 0.45 gallons per minute (1.7 l/m) of hot
water demand is required to activate the heater. Confirm at
least 0.4 gpm flow by timing how long it takes to fill a
container. A quart container should fill in 20 seconds or
less, from hot water tap only. Gradually increase water flow
(hot water demand) through the heater to determine if the
heater activates with higher flow.
6. Clean inlet filter screen per chapter 4.10, page 37.
7. Inspect the water path for obstructions. Make sure all
shower heads, faucet aerators and whole house filters are
clear of debris.
8. Check for plumbing crossover. A crossover in the hot and
cold plumbing pipes creates back pressure on the water
flowing through the heater. Therefore, a higher flow rate
than normal is needed to force the heater to activate. To
check for a plumbing crossover, shut off the cold water
supply to the water heater. Then open all of the hot water
taps served by the heater. Wait 10 minutes and check for
water flow at each tap. There should be no water flowing.
Any continuous flow of water, small or large, indicates a
crossover is present and must be corrected. Consult a
professional plumber for help in correcting a crossover.
Failing single lever faucet mixing valves are common causes
of plumbing crossovers.
8.3 Water is too hot
1. Selected temperature on the unit is too high. To lower
output temperature, see chapter 6.4, page 47.
2. Confirm the heater's gas type coincides with the type of gas
being supplied. See fig. 2, page 12 for location of rating
plate.
3. In areas where the water has a high mineral content,
periodic descaling may be necessary. See chapter 7.3,
page 57 for directions.
8.4 Water is not hot enough
1. Selected temperature on the unit is too low. To raise output
temperature, see chapter 6.4, page 47.
2. Confirm the heater's gas type coincides with the type of gas
being supplied. See fig. 2, page 12 for location of rating
plate.
3. Check inlet gas particle screen for blockage at gas inlet
connection on bottom of unit.
4. Verify gas pressure is in accordance with specifications in
chapter 4.14, page 44. A gas pressure reading is needed
to proceed further. Contact your original installer or a local
certified gas technician to obtain this reading.
5. Cold water is mixing into the hot water lines (plumbing
crossover). A plumbing crossover can unintentionally mix
cold water with the hot water leaving the heater. The end
result is a cooler water temperature than desired. To check
for a plumbing crossover, shut off the cold water supply to
the water heater. Then open all of the hot water taps served
by the heater. Wait 10 minutes and check all taps for water
flow. There should be no water flowing. Any continuous
flow of water, small or large, indicates a crossover and must
be corrected. Consult a professional plumber for help in
correcting a crossover. Failing single lever faucet mixing
valves are common causes of plumbing crossovers.
8.5 Low water flow/pressure
1. Too many hot water applications are being used
simultaneously or too much flow is demanded. The water
heater will effectively support two 2.0-2.5 GPM shower
heads simultaneously or multiple sink applications. Greater
draws will result in a water pressure drop and reduced flow
at faucets.
2. If selected temperature on the unit is set too high for the
demanded flow rate, the water heater will close its
motorized water valve, reducing the hot water flow rate in
an attempt to reach the selected output temperature.
Lowering the selected temperature will allow the motorized
water valve to open up for increased water flow rate.
3. Clean inlet filter screen per chapter 7.1, page 55 to
increase flow through the heater.
4. Inspect the water path for obstructions. Make sure all
shower heads, faucet aerators and whole house filters are
clear of debris. It may be necessary to upgrade to higher
flow rate shower heads if allowed by local code.
5. In areas where the water has a high mineral content,
periodic descaling may necessary. See chapter 7.3, page
57 for directions.