Unical ENERPUMP DHW 72, Installation And Service Manual

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Luxury Air Source Heat Pump-Monobloc System 43
Symptom 6: Space heating capacity shortage at low outdoor temperatures
Possible causes Corrective action
Backup heater operation is not
activated. Check the backup heater is turned ‘on’.
Check whether or not the thermal protector of the backup
heater has been activated.
Check whether or not the thermal fuse of the backup heater
is blown.
Too much heat pump capacity is used
for heating domestic hot water (applies
only to installations with a domestic hot
water tank). Check that the 'space heating priority temperature' field
settings are configured appropriately:
- Make sure that the space heating priority is enabled
Error codes
When a safety device is activated, the user interface LED will be flashing, and an error code will be
displayed.
A list of all errors can be found in the table below.
Code Error code description Possible reasons Correction methods
E0 HE outlet sensor failure
* The unit cannot run in
H/C mode, but can run in
DHW mode. 1) HE outlet sensor open circuit
2) HE outlet sensor short circuit
3) Main PCB damaged 1) Check the sensor connection
2) Replace the sensor
3) Replace the main PCB
E1 Water tank temp sensor
failure
* The unit cannot run in
DHW mode, but can run
in H/C mode. 1) Water tank sensor open circuit
2) Water tank sensor short circuit
3) Main PCB damaged 1) Check the sensor connection
2) Replace the sensor
3) Replace the main PCB
E2 HE inlet sensor failure
* The unit cannot run in
H/C mode, but can run in
DHW mode. 1) HE inlet sensor open circuit
2) HE inlet sensor short circuit
3) Main PCB damaged 1) Check the sensor connection
2) Replace the sensor
3) Replace the main PCB
E3 Water outlet sensor
failure
* The unit cannot run in
H/C mode, but can run in
DHW mode. 1) HE inlet sensor open circuit
2) HE inlet sensor short circuit
3) Main PCB damaged 1) Check the sensor connection
2) Replace the sensor
3) Replace the main PCB
E4 Outdoor heat exchanger
sensor failure
* The unit stops running. 1) Outdoor heat exchanger
sensor open circuit
2) Outdoor heat exchanger
sensor short circuit
3) Main PCB damaged 1) Check the sensor connection
2) Replace the sensor
3) Replace the main PCB