12 known error codes for this model

10 Moderate

Air supply or exhaust blockage detected.

11 Call a Pro

Ignition failure: burner did not ignite.

12 Call a Pro

Flame failure during operation.

14 Call a Pro

Thermal fuse / overheat protection fault.

16 Moderate

Outgoing water temperature exceeded safety threshold.

31 Call a Pro

Burner sensor error.

32 Moderate

Outgoing water temperature sensor fault.

33 Moderate

Heat exchanger outgoing temperature sensor fault.

52 Call a Pro

Modulating gas solenoid valve signal abnormal.

61 Call a Pro

Combustion fan failure detected.

72 Call a Pro

Flame sensing device fault.

LC Moderate

Scale buildup warning in heat exchanger.