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 current operating mode (with the red LED off) of the
heat pump water heater and the red LED, marked “ATTENTION”, may indicate a potential fault mode.
The green LED will emit either a solid glow or a series of flashes,
with a 2 second interval between each series. The green LED
may also emit a series of flashes in conjunction with the red LED
to indicate a particular fault condition with the system.
The red LED will emit either a solid glow or a series of flashes,
with a 2 second interval between each series. A series of flashes
indicates there may be a particular fault condition with the
system. A solid glow or 3 flashes (with the green LED off), or
1 flash (with a solid green LED) does not necessarily mean there
is a fault with the system.
The modes are:
Standby mode – water is hot
Call for heating received – system checks performed
Note: if call for heating received, unit may wait and continue flashing until five minutes
has elapsed after its last operation and until the compressor has cooled
Circulator commences circulation
Heat pump operation – compressor and fan running
No power at the water heater or to the heat pump or a possible fault condition
Refer to notes below before calling for service
Ambient temperature < 0°C Heating unit on
Evaporator < -3°C Heating unit on
Heating stopped due to insufficient flow rate Heating unit off
Notes
Power must be available at the water heater and to the heat pump for the LEDs to glow or flash.
Solid Red or 3 x Red Flashes (Green LED Off) – If the power supply to the water heater is on and the
green LED is off and the red LED is emitting a solid glow or three (3) flashes, this does not necessarily
mean there may be a fault with the water heater but is indicating the water heater is operating outside of
the heat pump‟s operating range. The heat pump‟s operating range is when the ambient air temperature
is 5°C or higher. Refer to “Heat pump operating range” on page 14 in the “Save A Service Call” section
of this Owner‟s Guide.
1 x Red Flash (Solid Green LED) – If the green LED is emitting a solid glow and the red LED is
flashing a single flash, this does not necessarily mean there may be a fault with the water heater. Refer
to “Red and Green LEDs Are Illuminated” on page 16 in the “Save A Service Call” section of this
Owner‟s Guide.
Other Red Flash Sequences – If the red LED emits a series of flashes other than three (3) flashes
(green LED off) or a single flash (green LED solid glow), there may be a fault with the water heater.
Before phoning to arrange a service inspection due to the red LED flashing or the green LED not
illuminating refer to “Heat Pump Is Not Operating” on page 14, “Green and Red LEDs Are Not
Illuminated On Operating Mode Monitor” on page 15, and “Red LED is Illuminated – Green LED is Off”
on page 15 in the “Save A Service Call” section of this Owner‟s Guide.
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