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AP18733 REV. 3.2.17
13
▪ D. TROUBLESHOOTING
To save time and money, review the following initial diagnostic steps before calling for service.
Problem Possible Solution
Burner Does Not Ignite
Make sure that the ON/OFF button on the Control Panel is ON
If the display on the Control Panel is blank, make sure the power cord is plugged in and 3A fuses
on the main controller in the water heater are good
Make sure that the water heater is supplied with water. The unit activates when inlet water ow
sensor detects ow over 0.5 gpm / 1.9 lpm.
Make sure the cold and hot water lines are not plumbed in reverse
Ensure the cold water and gas supply lines are open
Make sure the water lines are not frozen.
Water is Not Hot Enough
Ensure the temperature setting on the water heater is not too low
Ensure the lter in the cold water supply line is not clogged with debris
Make sure the water heater is connected to the correct gas supply
Check that supply and manifold gas pressures are in accordance with specications
Ensure the water flow sensor with three wires is properly connected on the top of the heat
exchanger
Water is Too Hot
Ensure the temperature setting is not too hot
Ensure the lter in the cold water supply line is not clogged with debris
Make sure the water heater is connected to the correct gas supply
Hot Water Temperature Fluctuates at Tap
Ensure the lter in the cold water supply line is not clogged with debris
Make sure the water heater is connected to the correct gas supply
Ensure the supply gas pressure is sufcient
The Blower Continues to Operate After
Combustion Stops
This is normal. The blower operates for one minute after combustion has stopped to vent the
remaining exhaust gas from the ue.
Cannot Change the DHW Mode Setpoint
above 120
°
F (49
°
C)
This is a safety device to prevent scalding. Hot water temperature over 125
°
F (51
°
C) can cause
instant severe burns or death. To change water temperature above 120
°
F (49
°
C), see CHANGING
THE DHW SET-POINT section, this manual.
The Water Heater Makes Abnormal Sounds
During Operation
Ensure the venting installation complies with the installation manual.
Ensure supply gas pressure is sufficient. Insufficient gas pressure will cause unstable burner
ame and noise.
Table 2 – Troubleshooting Chart
WARNING
This water heater is equipped with a blocked vent shutoff system. If Error Codes Er:29, Er:41, or Er:94 occur, turn off the gas valve at the manual
shutoff. Check the vent terminations for obstructions. If no obstructions are found, reset the water heater by pressing the power button. If the error
continues to occur, call a qualied service technician or the gas supplier to check the water heater. Failure to follow these instructions could result
in property damage, personal injury, or death.
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