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1, 2, 4, 5, 6 or 7 x Red Flashes – Green LED Is Off
If the red LED is flashing either 1, 2, 4, 5, 6 or 7 x red flashes and the green LED is off, the heat pump will
not operate and the water will be heated by the booster heating unit in booster heating mode to ensure a
supply of hot water. The boost capacity of the heating unit in booster heating mode is 220 litres and the
water will be heated to 60°C.
At the end of the heating cycle with the booster heating unit, the green LED will display a solid glow (standby
mode – water is hot) and the red LED will stop flashing. The fault condition which led to the red LED flashing
may be cleared when the backup heating cycle has completed.
At the commencement of the next heating cycle by the heat pump, if the red LED recommences to flash the
fault condition may not have cleared and there may be a problem with the heat pump or the water heater.
Count the number of red flashes and phone Rheem Service or their nearest Accredited Service Agent to
arrange for an inspection.
Depending upon the circumstances if 1 x red flash is occurring, the water heater may switch to backup
heating mode instead of booster heating mode. The boost capacity of the heating unit in backup heating
mode is 110 litres and the final water temperature is 70°C. Refer to “Water Too Hot” on page 13.
RED AND GREEN LEDS ARE ILLUMINATED
1 x Red Flash and Solid Green LED – this indicates heating has stopped by the heat pump before the
heating cycle was completed. This does not necessarily indicate a problem with the heat pump if it has been
operating. This can occur frequently during periods of hot weather and occasionally at other times due to an
increased efficiency of the system.
If this LED sequence continues for an extended period of time without correcting itself or there is an
inadequate hot water supply, then there may be a problem with the heat pump. Phone Rheem Service or
their nearest Accredited Service Agent to arrange for an inspection.
1 to 5 Red Flashes and 1 to 5 Green Flashes – if the red and green LEDs are flashing simultaneously the
heat pump will not operate and the water heater will switch to booster heating mode to ensure a supply of
hot water if heating is required. The boost capacity of the heating unit in booster heating mode is 220 litres
and the final water temperature is 60°C.
At the end of the heating cycle with the booster element, the green LED will display a solid glow (standby
mode – water is hot) and the red LED will stop flashing. The fault condition which led to the red LED flashing
may be cleared when the backup heating cycle has completed.
At the commencement of the next heating cycle by the heat pump, if the red and green LEDs recommence to
flash, the fault condition may not have cleared and there may be a problem with the heat pump or the water
heater. Count the number of red flashes and phone Rheem Service or their nearest Accredited Service
Agent to arrange for an inspection.
TEMPERATURE PRESSURE RELIEF VALVE RUNNING
Normal Operation
It is normal and desirable this valve allows a small quantity of water to escape
during the heating cycle. However, if it discharges more than a bucket full of
water in 24 hours, there may be another problem.
Continuous dribble
Try gently raising the easing lever on the relief valve for a few seconds (refer
to “Temperature Pressure Relief Valve” on page 10). This may dislodge a
small particle of foreign matter and clear the fault. Release the lever gently.
Steady flows for long periods (often at night)
This may indicate the mains water pressure sometimes rises above the
designed pressure of the water heater. Ask your installing plumber to fit a
pressure limiting valve.
Warning: Never replace the relief valve with one of a higher pressure rating.
Heavy flows of hot water until the water heater is cold - then stops until water reheats
The water heater must be switched off at the isolating switch or switchboard. Phone Rheem Service or
their nearest Accredited Service Agent to arrange for an inspection.
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