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16
Backup heating mode and series of red flashes
During the backup heating mode by the booster heating unit, caused by either the thermal cut out
activating or a heat pump fault condition, the red LED will emit a series of flashes.
At the completion of a heating cycle by the booster heating unit in the backup heating mode and the
water temperature reaches 70°C, the thermostat controlling the booster heating unit opens circuit cutting
power to the heat pump causing the red LED to go out. The fault mode is recorded to the heat pump
controller‟s memory. The fault condition which led to the red LED flashing may be cleared when the
backup heating cycle has completed.
Both LEDs 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.
The red LED will recommence to flash the fault mode for thirty (30) seconds and then extinguish. If the
red LED then recommences to flash, the fault condition which led to the red LED flashing may not have
cleared and there may be a problem with the heat pump. Count the number of red flashes and phone
Rheem Service or their nearest Accredited Service Agent to arrange for an inspection.
At the end of the thirty (30) second period, the green LED will commence 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.
Note:
If the green LED is glowing, then to check whether there may be problem with the heat pump,
open a hot tap and allow to run for ten to fifteen minutes. This will draw cold water into the lower part of
the water heater and the green LED will commence to flash. Close the hot tap when the green LED
commences to flash.
The heat pump will commence to operate when the green LED is flashing and at least 45 minutes has
elapsed after power is reinstated to the heat pump, i.e. 45 minutes after the red LED flashed the fault
mode for thirty (30) seconds and then extinguished.
If the heat pump stops operating and the red LED recommences to flash, the fault condition which led to
the red LED flashing may not have cleared and there may be a problem with the heat pump. Count the
number of red flashes and phone Rheem Service or their nearest Accredited Service Agent to arrange
for an inspection.
Note:
If the ambient air temperature is outside of the heat pump‟s operating range, the water heater may
switch to the booster heating unit (long green flash) to heat the water in booster heating mode.
The fault mode is cleared from the heat pump controller‟s memory after the water heater successfully
completes a full heat up cycle using the heat pump.
Green LED is off
There may be a fault condition with the heat pump if:
there is power available at the water heater and the green LED is off, and
the water heater
has not
operated outside of the heat pump‟s operating range – refer to
“Heat
pump operating range”
on page 15.
Before phoning to arrange a service inspection:
inspect the isolating switch marked “HOT WATER” or “WATER HEATER” at the switchboard and
the isolating switch (if one is installed) at the water heater and ensure they are turned on
check the fuse marked “HOT WATER” or “WATER HEATER” at the switchboard
if a timer has been installed, check the time settings
check the power supply tariff the water heater is connected to confirm power should be available to
the water heater.
Refer also to
“Thermal cut out activated”
on page 15 and to
“Heat pump fault condition”
on page 15.
If the green LED is off and one of these conditions is not the cause, phone Rheem Service or their
nearest Accredited Service Agent to arrange for an inspection.
