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14 Rinnai Corporation RHFE-750ETR
Fault Codes
If there is a malfunction the appliance may shut down as a safety precaution and display a fault code to assist in
diagnosing the problem. The fault code will flash in the Fault Code Display window and the Operation Indicator
will flash green.
Code Fault Remedy
11 Ignition failure
Confirm that the gas supply is turned on. Switch appliance to
STANDBY and then ON again. If ignition failure continues
then a Service call is required.
12 Incomplete combustion Service call
14 Filter blocked or Overheat
Clean filters
If overheating continues then a service call is required to
determine the cause.
Thermal fuse; a qualified service technician must replace the
fuse following the procedure below.
16 Room overheat
The temperature has reached 104° F (40° C). Turn the
appliance off or engage the AUTO OFF function to prevent the
display of flame. See AUTO OFF section.
31 Room temperature sensor faulty Service call
32 Overheat temperature sensor faulty Service call
53 Spark sensor faulty Service call
61 Fan motor faulty Service call
71 Solenoids faulty Service call
72 Flame detection circuit fault Service call
73 Communication fault Service call
99 Flue block Check around flue terminal for obstructions to air flow
The cause of the overheat condition needs to be
determined and remedied before replacing the
thermal fuse.
A qualified service technician needs to:
1. Disconnect the appliance from the power supply.
2. Remove the right hand side panel to allow access
to the gas control and main PCB.
3. Unplug the thermal fuse harness (including the
control plug for the POV on the gas control) and
unscrew thermal fuse.
4. Re-assemble with replacement thermal fuse.
PCB
POV
Thermal Fuse
Replacement of Thermal Fuse