ABOUT YOUR WATER HEATER
6
OPERATING MODE MONITOR
An operating mode monitor is located on the front of the heat pump module and houses a green and a red
LED.
The green LED, marked “normal”, indicates the operational mode of the heat pump water heater and the red
LED, marked “attention”, indicates a fault mode.
The green LED will emit either a constant glow or a series of flashes, with a 2 second interval between each
series. A series of long green flashes may also be emitted.
The red LED will emit a series of flashes, with a 2 second interval between each series, only if there is a
particular fault condition with the system.
The modes are:
Standby mode – waiting to heat
Call for heating received – system checks performed
(heat pump heating or heating unit operation determined)
Pump commences circulation at full speed
Compressor and fan operation established
(heat pump operating)
Heating unit on – ambient air temperature
below 3°C to 5°C or above 45°C to 55°C
If the power supply to the water heater is on and the green LED is off or the red LED is flashing, this
indicates there may be a fault with the water heater. The red LED may emit up to six flashes in each series of
flashes.
The fault which leads to the red LED flashing may be cleared when the heating cycle is complete and the
thermostat cuts power to the booster heating unit. The heat pump will then return to normal operation and
the green LED will commence operating. If the red LED continues or recommences to flash, count the
number of flashes and phone your nearest Rheem Service Department or Accredited Service Agent to
arrange for an inspection.
Note: Following a heating cycle by the booster heating unit, the thermostat opens circuit cutting power to the
booster heating unit and heat pump. When the thermostat next closes circuit switching power on to the heat
pump or if the electrical supply is switched off and on again at the isolating switch to the water heater, the red
LED will display the fault code for thirty (30) seconds that led to the booster heating unit being activated.
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