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ERROR MESSAGES
Troubleshooting without controllers
If you have not installed temperature controllers and experience the following
symptoms, please carry out the suggestions below. If symptoms continue, please
contact Rinnai for advice.
NOTE: Faults caused by insufficient gas/water supply or gas/water quality and
installation errors are not covered by the manufacturer’s guarantee.
Installations with circulation pumps
With temperature controller fitted.
If you have an installation using a secondary circulation pump this must be
switched off so that there is no flow through the heater when starting or after a
power failure. If the pump is running the unit will not operate (no display on the
controller). Isolate pump then start heater before restarting pump. This is a safety
feature.
The pump should also be fitted with a thermostat to prevent the return temperature
reaching the heater set point temperature.
Without temperature controller fitted.
The heater should automatically reset and provide water at the temperature set by
the internal limit switches.
Fault Remedy
Heater does not attempt
to start at all.
Check the power is on at the heater.
Check the cold water valve supplying the heater is open.
Heater starts then shuts
down immediately.
Check the power is on.
Check the gas valve at the heater and at the gas meter is fully open.
Open the hot water tap fully.
Heater starts then the
water goes cold.
Check the power is on.
Open your hot water tap further or try another hot outlet.