Code | Code Description |
14 | Thermal Fuse |
16 | Over Temperature |
| Warning |
25 | Condensate Trap |
| Error |
31 | Burner Sensor Error |
32 | Outgoing Water |
| Temperature Sensor |
| Fault |
33 | Heat Exchanger |
| Outgoing Temperature |
| Sensor Fault |
52 | Modulating Solenoid |
| Valve Signal Abnormal |
61 | Combustion Fan |
| Failure |
65 | Water Flow Control |
| Fault |
71 | SV0, SV1, SV2, and |
| SV3 Solenoid Valve |
| Circuit Fault |
72 | Flame Sensing Device |
| Fault |
73 | Burner Sensor Circuit |
| Error |
LC | Scale |
| Exchanger (when |
| checking maintenance |
| code history, “00” is |
| substituted for “LC”) |
Remedy
Check gas type of unit and ensure it matches gas type being used. Check for restrictions in air flow around unit and vent terminal.
Check for low water flow in a circulating system causing
Check for foreign materials in combustion chamber and/or exhaust piping. Check heat exchanger for cracks and/or separations.
Check heat exchanger surface for hot spots which indicate blockage due to scale build- up. Refer to instructions in manual for flushing heat exchanger.
Measure resistance of safety circuit.
Ensure high fire and low fire manifold pressure is correct. Check for improper conversion of product.
Check for restrictions in air flow around unit and vent terminal.
Check for low water flow in a circulating system causing
Condensate container is full.
Check condensate drain for blockage. Replace condensate trap.
Measure resistance of sensor.
Replace sensor.
Check sensor wiring for damage. Measure resistance of sensor. Clean sensor of scale
Check sensor wiring for damage. Measure resistance of sensor. Clean sensor of scale
Check modulating gas solenoid valve wiring harness for loose or damaged terminals. Measure resistance of valve coil.
Ensure fan will turn freely.
Check wiring harness to motor for damaged and/or loose connections. Measure resistance of motor winding.
The water flow control valve has failed to close during the bath fill function. Immediately turn off the water and discontinue the bath fill function. Contact a state qualified or licensed contractor to service the water heater.
Replace the PC board.
Ensure flame rod is touching flame when unit fires. Check all wiring to flame rod for damage.
Remove flame rod and check for carbon
Check inside burner chamber for any foreign material blocking flame at flame rod. Measure micro amp output of sensor circuit with flame present.
Replace flame rod.
Check sensor wiring and PC board for damage. Replace sensor.
Flush heat exchanger. Refer to instructions in manual. Replace heat exchanger.
NOTE: The LC code is the only error code that will allow the unit to keep running. The display will alternate between the LC code and the temperature setting. The controller will continue to beep. The LC code will reset if power is turned off and then on.
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