Rinnai 35
HW Demand Duo Systems OIM
The Rinnai Continuous Flow water heaters have self diagnostic capability. If a fault occurs, an Error Code will flash
on the status monitor or inbuilt controller. If you have Temperature Controllers, this assists with diagnosing the
fault, and may enable you to overcome a problem without a service call. Please quote the code displayed when
enquiring about service.
HD Fault Codes
Code
Description
Remedy
-
Noticeable reduction in water flow
Inlet water filter needs to be cleaned - Service call
03
Power interruption during Bath fill
(Water will not flow on power reinstatement)
Turn off all hot water taps Press On/Off twice
05
By-Pass Flow Control Failure
Service Call
10
Air Supply or Exhaust Blockage
or Condensate Pipe Blockage
Service Call
11
No ignition / No gas supply
Check gas is turned on at water heater and gas
meter or cylinder
12
Flame Failure / Low gas flow
Check gas is turned on at water heater and gas
meter or cylinder. Check there are no obstructions to
the flue outlet
14
Heat Exchanger Overheat Failure
Service Call
15
Venturi Control Failure
Service Call
16
Over Temperature Warning
Service Call
17
Venturi Blockage
Service Call
19
Electrical Earthing Failure
Service Call
21
Data Transfer Error
Service Call
32
Outgoing Water Temperature Sensor Failure
Service Call
33
Heat Exchanger Thermistor Failure
Service Call
34
Combustion Air Temperature Sensor Failure
Service Call
38
Exhaust Thermistor Failure
Service Call
41
Freeze Protection Thermistor Failure
Service Call
51
Inlet Thermistor Failure
Service Call
52
Gas Valve Failure
Service Call
54
High Exhaust Gas Temperature Failure
Service Call
S5
Scheduled Service Reminder
Service Call
Se
Cascade Connection Failure
Service Call
61
Combustion Fan Failure
Service Call
65
Water Flow Control Failure
(Does not stop flow properly)
Service Call
70
PCB Failure
Service Call
71
Solenoid Valve Circuit Failure
Service Call
72
Flame Rod Failure
Service Call
Wireless water controller (when fitted) is ‘Out of
Range’ due to the distance from transceiver or
an obstruction.
Move wireless water controller or transceiver or
remove the obstruction.
NOTE
Some fault codes are model specific and so not all codes will display on all models. If the fault
code being displayed is not listed above, contact Rinnai for advice.
In the majority of cases, you may be able to clear the Error Code simply by turning the hot water
tap OFF, then ON again. If this does not clear the Error Code, try pushing the On/Off button OFF,
then ON again. If the Error Code still remains, contact Rinnai for advice.
FAULT FINDING
