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Operation and Installation Manual
29
4. Troubleshooting
4. Troubleshooting
PROBLEM
POSSIBLE CAUSE
SOLUTION
The heat pump fails to start. The
compressor unit is not running.
The preset temperature has been reached.
Increase the preset temperature.
Check that the DHW is not heated by a different heat source, e.g. a boiler, solar panels, or the
electric heater. This prevents the heat pump from running.
Another heat source is running (solar panels, a boiler, or
the electric heater).
Change the configuration settings of that heat source or the boiler settings. An additional heat
source is probably configured with a higher priority (if managed by a PC-based controller). CH
boiler: always; solar panel: as scheduled.
The unit is in a wrong operating mode.
“System Failure”: the error alarm is triggered by an incorrect heat load on the heat pump (the
DHW is emergency-heated with the electric heater). Check the flow and pressure of water in the
system, the condition of the filter screen in the system, the correct operation of the circulation
pump; make sure that the system has been bled of air (check also the vent valve of the unit). If
the unit is located below the DHW tank heat coil, the vent valve of the heat pump will not be
at the highest point of the system, in which case an additional air vent must be installed at the
highest point of the DHW system. Delete the error alarm by opening the Service Settings and
delete the Check Temperature alarm (MENU > SERVICE SETTINGS, Code: 1111 > DELETE CHECK
T. ALARM). If the error alarm persists, contact the Customer Service.
“Pressure switch failure”: the error alarm is triggered when the maximum pressure in the
system is exceeded (the DHW is emergency-heated with the electric heater). Cycle the power of
the unit. If the error alarm persists, contact the Customer Service.
“Sensor Error” (e.g. of the evaporator or a check alarm): the error alarm is caused by failure or
broken / incorrect connection of the specified sensor (the DHW is emergency-heated with the
electric heater). Check the connections. If the sensor has failed, have it replaced by the Customer
Service or purchase a replacement from the manufacturer's online store.
DHW tank sensor fault.
“DHW tank sensor failure”: the error alarm is triggered by failure or broken / incorrect con-
nection of the specified sensor. Check the wiring connections (wiring plugs) in the back of the
controller module. If the sensor has failed, have it replaced by the Customer Service or purchase
a replacement from the manufacturer's online store.
Compressor off time.
When the compressor off time expires, the compressor unit will restart.
The unit is out of the preset work schedule.
Modify the work schedule settings and make sure that the date and time settings are correct. If
the heat pump is permitted to run per the preset work schedule, the following icon is displayed:
The compressor capacitor has failed or the compressor
overtemperature protection has been tripped.
Contact the Customer Service.
The power consumption is too high.
The electric heater is on
(shown by the flashing heater icon
).
Note:
The electric heater is not installed in the unit; it is an
optional accessory which can be operated by the heat
pump controller.
“ECO+”: the electric heater provides additional heat for a higher DHW temperature. To avoid
this, reduce the DHW temperature setting below the ECO- ECO+ limit.
“Party” mode
- the DHW production is in the fast heating mode and uses all available
heat sources, which keeps the electric heater on. When the DHW temperature reaches the ECO-
ECO+ limit, the heat pump will stop, while the electric heater continues to work. You can restore
the normal operating mode by disabling the “Party” mode (MENU > PARTY MODE > DISABLE).
“Anti-Legionella” mode
- the antibacterial treatment cycle is running. This requires heat-
ing the DHW to a higher temperature with the electric heater (optional). When the antibacterial
treatment cycle is complete, the heat pump will return to the normal operating mode.
The circulation pump is running.
Correct the circulation pump settings (if managed by a PC-based controller).
Heat is transferred from the DHW tank to the CH system.
Check the connections between the heat pump DHW tank and other heat sources. Check valves
should be installed at the heat coil connected to another heat source (e.g. a boiler) to prevent
heat from escaping the DHW tank when the heat pump is working. If no check valves have been
installed, close the respective stop valves when the heat pump is used.
WZÓR
