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Error Faulty Remedy
32 Outgoing Water Check sensor wiring for damage.
Temperature Check resistance onsensor.
Sensor Faulty Check and clean dirt from sensor.
Replace sensor.
33 Heat Exchanger Check sensor wiring for damage.
Outgoing Check resistance on sensor.
Temperature Check and clean dirt from sensor.
Sensor Faulty Replace sensor.
34 Combustion Air Check sensor wiring for damage.
Temperature Check resistance on sensor.
Sensor Faulty Check and clean dirt from sensor.
Clean blower blades, if dirty.
Ensure fan blade is tight on motor shaft and it is in good condition.
Check for restrictions in air flow around unit and vent terminal.
Replace sensor.
52 Modulating Check modulating gas solenoid valve wiring harness for loose or damage terminals.
Solenoid Check resistance on solenoid valve.
Valve Signal
Abnormal
61 Combustion Ensure fan motor will turn freely. Motor will operate with a small amount of resistance.
Fan Failure Check wiring harness to motor for damaged and/or loose connections.
Check resistance on motor winding.
71 SV0, SV1, Check wiring harness to all solenoids for damage and/or loose connections.
SV2, and SV3 Check resistance on each solenoid.
Solenoid Valve
Circuit Faulty
72 Flame Sensing Check micro amps produced by flame rod.
Device Faulty Remove flame rod and check for carbon build-up, clean with sand paper.
Ensure flame rod is touching flame when unit fires.
Check inside burner chamber for any foreign material blocking flame at flame rod.
Check all wiring to flame rod for damage.
Replace flame rod.
LC Scale Build-up Turn off power supply, then reapply power;
in Heat if code reappear separate control wires from the unit’s power supply.
Exchanger Flush heat exchanger.
Replace heat exchanger.
No code Nothing happens Clean inlet water supply filter.
when water flow Ensure you have at least the minimum flow rate required to fire unit.
is activated. Check for pipe dope inside water flow control turbine.
On new installations ensure hot and cold water lines are not crossed.
Check for bleed over. Isolate unit from building by turning off hot water line to building,
then open your pressure relief valve. If unit fires, there’s a bleed over in your plumbing.
If a circulating system is in use, it must be isolated also.
Remote control does not light up but you have 12 VDC at the terminals for controls.
Disconnect water flow control motor, then turn on hot water, if unit fires replace water
flow control assembly.
Check resistance on the water flow control sensor.
VI - TROUBLESHOOTING (cont.)
Error Messages