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Rinnai Heavy Duty (commercial) fault codes

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

Fault codes

Code Meaning What you can do
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
14 Overheat safety device tripped Call a pro
15 Venturi control failure Safe checks first, then a pro
16 Over-temperature shutdown Safe checks first, then a pro
17 Venturi blockage Safe checks first, then a pro
18 Gas valve adjustment limit Call a pro
19 Electrical earth fault Call a pro
21 Data transfer or dip switch error Call a pro
22 Gas valve adjustment 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
36 Lower tank thermistor fault 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
55 Service reminder Safe checks first, then 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
66 Bypass flow control fault Call 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
LC Scale build-up in the heat exchanger Safe checks first, then a pro
SE Cascade connection failure Call a pro

Models in this range