Error Codes

Code

Description

02 No burner operation during freeze protection mode
03 Power interruption during Bath Fill (Water will not flow when power returns)
05 Bypass Servo” (on all water heaters with bypass valves) - On the RH-180 this is a “Air Filter Error”
07 Circulation Flow Rate has dropped below 2.1 gpm
10 Air Supply or Exhaust Blockage
11 No Ignition (heater not turning on)
12 Flame Failure
13 Combustion
14 Thermal Fuse has activated
16 Over Temperature Warning (Safety shutdown because unit is too hot)
19 Electrical Grounding
25 Condense Trap is full
30 Flammable Vapors Detected
31 Burner Sensor
32 Outgoing Water Temperature Sensor
33 Heat Exchanger Outgoing Sensor
34 Combustion air temperature sensor failure
35 Tank Temperature Sensor
38 CO Sensor

Code

Description

41 Freeze Protection Sensor
51 Inlet Water Temperature Sensor
52 Modulating Solenoid Valve Signal
57 Burner Overheat Bi-Metal Switch
58 Secondary Heat Exchanger Sensor
61 Combustion Fan Motor
63 Circulation Flow Rate dropped below 1.3 GPM
65 Water Flow Control
FE Flammable Vapors Detected
FF Maintenance has been performed
70 PC Board
71 Solenoid Valve Circuit
72 Flame Sensing Device
73 Burner Sensor Circuit
79 Water Leakage Detected
LC Lime Scale Build-up
LC0 Lime Scale Build-up
LC1 Lime Scale Build-up
LC2 Lime Scale Build-up
LC3 Lime Scale Build-up
LC4 Lime Scale Build-up
LC5 Lime Scale Build-up
LC6 Lime Scale Build-up
LC7 Lime Scale Build-up
LC8 Lime Scale Build-up
LC9 Lime Scale Build-up