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15
or
the red LED is flashing (other than 3 x red flashes with the green LED off, or a solid red glow, or a
single red flash with a solid green LED) – the red LED may emit up to seven (7) flashes in each
series of flashes. The green LED may also simultaneously flash or display a solid glow.
The fault condition which led to the red LED flashing may be cleared after the backup heating cycle
by the booster heating unit has completed. If the red LED continues to or recommences to flash, or
recommences to flash after the heat pump next operates or attempts to operate, a service call may
be required.
Before phoning to arrange a service inspection due to the red LED flashing, refer to “Green and
Red LEDs Are Not Illuminated On Operating Mode Monitor” on page 15, “Red LED is Illuminated –
Green LED is Off” on page 15 and “Red and Green LEDs Are Illuminated” on page 16.
GREEN AND RED LEDS ARE NOT ILLUMINATED ON OPERATING MODE MONITOR
Is the isolating switch marked “HOT WATER” or “WATER HEATER” at the switchboard and the isolating
switch at the water heater turned on?
Check the fuse marked “HOT WATER” or “WATER HEATER” at the switchboard.
Is the water heater connected to a time controlled power
supply or installed in conjunction with a timer?
Refer to “Time controlled power supply – no power at the
water heater (green and red LEDs are off)” on page 14.
Is the water heater supplying hot water, but the Heat Pump
does not appear to be operating?
Refer to “Water Too Hot” on page 13.
If the green and red LEDs are off and one of these conditions is not the cause, phone Rheem Service or
their nearest Accredited Service Agent to arrange for an inspection.
RED LED IS ILLUMINATED – GREEN LED IS OFF
The illumination of the red LED does not necessarily mean there is a fault with the system. A constant glow
or 3 x flashes of the red LED indicates an operational mode of the water heater.
Solid Red or 3 x Red Flashes – Green LED Is Off
Solid Red (Green LED is off) – this indicates the ambient air temperature has fallen to below 0°C. This is not
a fault condition but indicates an operational mode of the water heater. This will occur whether or not the
water heater is up to temperature (solid green LED if air temperature 0°C or higher) or the booster heating
unit is heating. When the ambient air temperature increases to above 2°C, the heat pump will return to
normal operation. The LEDs will display either a solid green LED if water is hot, or 4 x green LED if the heat
pump operates, or 3 x red flashes if the ambient air temperature remains outside of the heat pump‟s
operating range and the water is being heated in booster heating mode.
3 x Red Flashes (Green LED is off) – this indicates the ambient air temperature has fallen to below 5°C and
the water is being heated in booster heating mode. This is not a fault condition but indicates an operational
mode of the water heater. When the ambient air temperature increases to 5°C or higher, the heat pump will
commence operating, the green LED will illuminate and the red LED will stop flashing. If the ambient air
temperature falls to below 0°C, the red LED will show a constant glow.
Refer to “Heat pump operating range” on page 14.
If the red LED is a emitting a solid glow or 3 x flashes (green LED is off) and the ambient temperature is
above 10°C, there may be a fault with the heat pump. Phone Rheem Service or their nearest Accredited
Service Agent to arrange for an inspection.
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