SAVE A SERVICE CALL
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HEAT PUMP IS NOT OPERATING
• Power must be available at the water heater and the water heater switched on.
If there is power to the water heater, check the water heater has been turned “On” at the Display Panel.
Refer to “Turning the Water Heater “On” or “Off” at the Display Panel” on page 15.
• Time controlled power supply
If the water heater is connected to a time controlled power supply, then during periods of no power supply
at the water heater, the heat pump and electric heating unit will not operate.
This is not a fault condition, but a result of no power being available to operate the water heater.
Check the hours of supply from the electricity retailer.
The Display Panel will illuminate again when power is available again at the water heater.
Note: If power was cut to the heat pump whilst it was operating, it may wait for a few minutes before
recommencing to operate when power is restored and if heating is required.
• Heat pump operating range
The heat pump’s operating range is when the ambient air temperature is from -6°C to 43°C. It will not
operate outside of this temperature range.
The electric heating unit will operate if the ambient air temperature is outside of the heat pump’s operating
range and heating of the water is required.
The water in the water heater will be heated to the Hot Water Temperature Set Point.
• Possible fault condition
If the heat pump has developed a fault with a fault code of F01 to F09, F12 or F13, the heat pump will not
operate, and the fault code will be displayed on the Display Panel in the Timer / Clock Display Area. In
this condition and depending upon the fault code, if heating of the water is required, the electric heating
unit will operate automatically to heat the water in the water heater. Refer to “Fault Codes” on page 21.
Take note of the fault code and phone Rheem Service or their nearest Accredited Service Agent to arrange
for an inspection.
TEMPERATURE PRESSURE RELIEF VALVE OR EXPANSION CONTROL VALVE RUNNING
• Normal Operation
It is normal and desirable the temperature pressure relief valve or expansion
control valve (if fitted) allows a quantity of water to escape during the heating
cycle. This quantity should be equal to approximately 1/50 of the hot water
used, as water expands by this volume when heated. However, if it discharges
more than a bucket full of water in 24 hours, there may be another problem.
The expansion control valve (if fitted) will discharge water instead of the
temperature pressure relief valve as it has a lower pressure rating. A benefit is
that energy is conserved as the discharged water is cooler. This valve is
installed in the cold water line to the water heater.
Refer to the cold water connection diagram on page 37.
• Continuous dribble
Try gently raising the easing lever on the relief valve for a few seconds (refer
to “Relief Valves” on page 8). 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 from the temperature pressure relief valve 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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