Rheem MPi Series Installation Instructions Manual page 36

COMMISSIONING
Possible fault condition
If there is power to the water heater and the green LED is off or the red
LED is flashing, this indicates there may be a fault condition with the water
heater. The red LED may emit up to nine flashes in each series of flashes.
There may be a fault condition with the water heater if either:
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.
Before phoning to arrange a service inspection due to the green LED
being off, refer to "Heat Pump Is Not Operating" in the "Save A
Service Call" section of the Owner‟s Guide and Installation
Instructions supplied with the heat pump storage tank.
or
the red LED is flashing – the red LED may emit up to nine flashes in

each series of flashes
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. When heating is next required the red LED will
recommence to flash the fault code for 27 seconds and then
extinguish. If the red LED then recommences to flash or
recommences to flash after the heat pump next operates, a service
call may be required.
Before phoning to arrange a service inspection due to the red LED
flashing, refer to "Heat Pump Is Not Operating" in the "Save A Service
Call" section of the Owner‟s Guide and Installation Instructions
supplied with the heat pump storage tank.
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