Diagnostic Codes
This water heater is designed to display diagnostic codes. If there is a potential operation concern refer to the
code and remedy on the next page.
Front Panel Display Indications
- -
Standby (power is supplied but there is no demand for hot water).
On
Hot water is being supplied.
FL or FH
Stands for Forced Low and Forced High combustion. Only seen during the gas pressure
setting procedure which is done when certain components are replaced.
Error code flashing
The error code will stop flashing after the problem is corrected and the water heater
supplies hot water.
WARNING
Code
Definition
No burner operation during freeze
02
protection mode
Power interruption during Bath
03
Fill (Water will not flow when
power returns).
10
Air Supply or Exhaust Blockage
No Ignition
11
(heater not turning on)
12
No Flame
26
Some of the checks below may need to be done by a licensed professional. Call a
licensed professional for any remedy that involves gas or electricity. Call a licensed
professional if you have any doubt or reservation about performing the remedy
yourself.
licensed
professional
only
licensed
professional
only
licensed
professional
only
Remedy
Service Call
Turn off all hot water taps. Press ON/OFF twice.
Check that nothing is blocking the inlet or exhaust.
Verify dip switches are set properly.
Check fan for blockage.
Check that the gas is turned on at the water heater, gas meter, or cylinder.
If the system is propane, make sure that gas is in the tank.
Ensure appliance is properly grounded.
Ensure gas type and pressure is correct.
Ensure gas line, meter, and/or regulator is sized properly.
Bleed all air from gas lines.
Verify dip switches are set properly.
Ensure igniter is operational.
Check igniter wiring harness for damage.
Check gas solenoid valves for open or short circuits.
Remove burner cover and ensure all burners are properly seated.
Remove burner plate and inspect burner surface for condensation or debris.
Check the ground wire for the PC board.
Check that the gas is turned on at the water heater, gas meter, or cylinder.
Check for obstructions in the flue outlet.
If the system is propane, make sure that gas is in the tank.
Ensure gas line, meter, and/or regulator is sized properly.
Ensure gas type and pressure is correct.
Bleed all air from gas lines.
Ensure condensation collar was installed properly.
Verify dip switches are set properly.
Check power supply for loose connections.
Check power supply for proper voltage and voltage drops.
Ensure flame rod wire is connected.
Check flame rod for carbon build-up.
Disconnect and reconnect all wiring harnesses on unit and PC board.
Check for DC shorts at components.
Check gas solenoid valves for open or short circuits.
Remove burner plate and inspect burner surface for condensation or debris.
V53e Manual