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Continuous Flow Water Heater Operation Guide 04-12
Troubleshooting without controllers
Fault
Possible solution
Unit does not start
Check power is on at the unit. Check gas isolation
valve at the unit and gas meter are fully open.
Unit starts and then shuts down immediately
Check power is still on. Check gas isolation valve at
the unit and gas meter are fully open. Open your hot
water tap fully.
Unit starts then water goes cold
Check power is still on. Open hot water tap fully.
Excessive temperature fluctuation while water is
flowing
Service call
Excessive noise or vibration from the water heater
Service call
Faults caused by insufficient gas supply, insufficient water supply, gas quality, water quality, installation errors or
operation errors are not covered by the Rinnai warranty.
