Failure
Probable cause
Recommended actions
Protection device
alarm
If the device resets automatically within an
hour, then compressor motor overheating
protection has tripped (motor gets hotter
when warm water temperature is higher and
cold water temperature lower). If not, then oil
alarm.
Reset by pressing the button in
the oil alarm device attached to
the compressor.* Try increasing
compressor minimum power to
improve oil flow.
Not starting
The heat pump controller is giving a start
signal, but the heat pump does not start or
the motor’s ON signal does not reach the
controller. Electrical problem, either contactor
or wiring.
Check wiring, contact Customer
Service.
Not stopping
The heat pump controller is giving a stop
signal, but the heat pump does not stop or
the motor’s OFF signal does not reach the
controller. Electrical problem, either contactor
or wiring.
Check wiring, contact Customer
Service.
*The oil alarm device is mounted on the lower right side of the compressor (right
at the front). To reset the alarm, press and hold the white button on the device for
approximately 2 seconds. The unit’s alarm indicator should start blinking at 1 second
intervals. This will continue for approximately 1 minute, after which the fault is reset.
Monitoring alarms
If there are active alarms in the system, the
Alarm
icon will be displayed on the control
panel’s screen. In the figure below, the alarm icon is displayed in the
Process
view.
Alarm active ver. 2
To view the alarm or fault, access the
Alarms
view by tapping on the
Alarm
icon.
Alternatively, open the
Process
view and tap on the
Alarms
button (marked in red in
the figure below).
Alarms button ver. 1
EXEP01 2150EN
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