1. Home
  2. Rinnai
  3. tankless water heaters
  4. Commercial (KB)

Rinnai Commercial (KB) error codes

Every checked code for the Rinnai Commercial (KB) range, with what it means and whether you can fix it yourself.

Error codes

Code Meaning What you can do
02 Burner did not light during freeze protection Safe checks first, then a pro
03 Power cut during bath fill You can often fix it
05 Bypass flow control failure Safe checks first, then a pro
10 Air intake, flue or condensate blockage Safe checks first, then a pro
11 No ignition Safe checks first, then a pro
12 Flame failure or low gas flow Safe checks first, then a pro
13 Combustion fault Safe checks first, then a pro
14 Overheat safety device tripped Call a pro
16 Over-temperature shutdown Safe checks first, then a pro
19 Electrical earth fault Call a pro
25 Sensor fault or condensate blockage (depends on model) Depends on your model
32 Outgoing water temperature sensor fault Call a pro
33 Heat exchanger thermistor fault Call a pro
34 Temperature sensor fault (depends on model) Call a pro
38 Exhaust temperature thermistor fault Call a pro
41 Frost protection (ambient) sensor fault Call a pro
51 Inlet water thermistor fault Call a pro
52 Gas modulating valve fault Call a pro
54 High exhaust gas temperature Safe checks first, then a pro
57 Burner overheat switch open Call a pro
58 Secondary heat exchanger overheat Call a pro
61 Combustion fan failure Call a pro
63 Recirculation low flow Call a pro
65 Water flow control failure Safe checks first, then a pro
70 Control board (PCB) failure Safe checks first, then a pro
71 Gas solenoid valve failure Call a pro
72 Flame rod circuit error Call a pro
73 Burner thermocouple fault Call a pro
79 Water leak detected Safe checks first, then a pro
LC Scale build-up in the heat exchanger Safe checks first, then a pro

Models in this range