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This appliance has the ability to check its own operation
continuously. If a fault occurs, an error code will flash
on the Display of the temperature controller. This
assists with diagnosing the fault and may enable you
to overcome a problem without a service call. Please
identify the code displayed when inquiring about service.
Some of the checks below may need to be done by a
qualified service technician. Call a service technician for any
remedy that involves gas or electricity. Call a service
technician if you have any doubt or reservation about
perform ng the remedy yourse f.
Table 13: Error Codes
Code Remedy
02 ServiceCall - Check for possiblefreezedamage to heatexchanger.
10
11
12
Fault
No burner operation during freeze
protection mode
Air Supply or Exhaust Blockage
No Ignition
Flame Failure
Ensure approved venting materials are being used.
Check that nothing is blocking the flue inlet or exhaust.
Check all vent components for proper connections.
Ensure vent length is within limits.
Ensure condensation collar was installed correctly.
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.
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 appliance is properly grounded.
Disconnect all 2-Unit or Multi-Unit connections to isolate the problem.
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 that the gas is turned on at the water heater and gas meter. Check
for obstructions in the flue outlet.
Ensure gas line, meter, and/or regulator is sized properly.
Ensure gas type and pressure is correct.
Bleed all air from gas lines.
Ensure proper venting material was installed.
Ensure condensation collar was installed properly.
Ensure vent length is within limits.
Verify dip switches are set properly.
Ensure appliance is properly grounded.
Disconnect keypad.
Disconnect all 2-Unit or Multi-Unit connections to isolate the problem.
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 all components for electrical short.
Check gas solenoid valves for open or short circuits.
Remove burner plate and inspect burner surface for condensation or debris.
305 & 505 Indoor Manual 29