Diagnostic Features Of Heat Pump Controller - Rheem 325 Owne's Manual And Installation Instructions

COMMISSIONING
DIAGNOSTIC FEATURES OF THE HEAT PUMP CONTROLLER
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:
Flashes
Operational Modes
solid green
Standby mode
(remains on)
Call for heating received – system checks performed
1 x green
(heat pump heating or heating unit operation determined)
2 x green Pump commences circulation at full speed
Compressor and fan operation established
3 x green
(heat pump operating)
Heating unit on – ambient air temperature below 3°C to 5°C or above 45°C to 55°C
long green
no green
Call for service
(remains off)
Flashes
Fault Modes
1 x red Heating unit on
2 x red Heating unit on
3 x red Heating unit on
4 x red Heating unit on
5 x red Heating unit on
6 x red Heating unit on
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.
compressor over temperature (possible pump fault)
compressor fault
compressor cooling fault
heat pump not operating – tank thermistor fault
heat pump not operating – evaporator thermistor fault
heat pump not operating – compressor thermistor fault
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