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15
HEAT PUMP IS NOT OPERATING
There must be power available at the water heater and to the heat pump for the heat pump to operate and
for the LEDs to glow or flash.
Time controlled power supply (no power at the water heater)
If the water heater is connected to a time controlled power supply, then during periods of no power
supply at the water heater the LEDs will be off.
This is not a fault condition, but a result of no power being available to energise the LEDs.
The green LED will recommence glowing or flashing when power is available again at the water heater.
Heat pump operating range (no power to the heat pump)
The heat pump‟s operating range is between an ambient air temperature of a minimum of 3°C to 5°C
and a maximum of 45°C to 55°C. The heat pump will not operate when the ambient air temperature is
outside the heat pump‟s operating range.
If heating is required, the water heater will commence heating with the booster heating unit in booster
heating mode (long green flash) instead. The water will be heated to 70°C during these periods.
At the completion of this heating cycle by the booster heating unit (long green flash), the thermostat
controlling the booster heating unit opens circuit cutting power to the heat pump causing the green LED
to go out.
This is not a fault condition, but a result of the power being cut to the heat pump by the thermostat.
The green LED will remain off for an extended period of time until the water temperature in the top of the
water heater drops to below 62°C and the thermostat closes circuit reinstating power to the heat pump,
when the red LED will emit a solid glow for three (3) seconds and then extinguish. The green LED will
then recommence to glow or flash.
The green LED will glow (standby mode – water is hot) if the water temperature in the lower part of the
water heater is 50°C or more.
The green LED will flash if the water temperature in the lower part of the water heater is less than 50°C.
If at least 45 minutes has elapsed after power is reinstated to the heat pump, i.e. 45 minutes after the
red LED emitted a solid glow for three (3) seconds and then extinguished, heating of the water by the
heat pump will recommence (3 x green flashes) if the ambient air temperature has moved back to within
the heat pump‟s operating range, or the water heater will switch to the booster heating unit (long green
flash) if the ambient air temperature is outside of the heat pump‟s operating range.
Thermal cut out activated
Has the thermal cut out activated and the red LED is flashing a series of single flashes?
The refrigeration circuit is protected by a thermal sensor. This will activate a thermal cut out in the event
of thermal surges or excessive heat in the refrigeration system.
If the thermal cut out has activated, the red LED will flash a fault mode of a series of single flashes and
the heat pump will not operate. The water heater will switch to backup heating mode using the booster
heating unit to ensure a supply of hot water. In backup heating mode the water will be heated to a
temperature of 70°C.
The thermal cut out will automatically reset itself when the booster heating unit has completed one
heating cycle and the compressor cools down.
Refer to
“Backup heating mode and series of red flashes”
on page 16.
Heat pump fault condition
If the heat pump has developed a fault, the heat pump will not operate, the red LED will flash a fault
mode of a series of one (1) to nine (9) flashes.
If a series of two (2) flashes occurs, the heat pump will not switch to backup heating mode. Phone
Rheem Service or their nearest Accredited Service Agent to arrange for an inspection.
If a single flash or a series of three (3) to nine (9) flashes occurs, the water heater will switch to backup
heating mode to ensure a supply of hot water.
Refer to
“Backup heating mode and series of red flashes”
on page 16.
