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Aquarea air-to-water heat pumps - Planning and installation manual - 02/2022
Appendix
8
Troubleshooting
The following symptoms do not indicate malfunction�
Symptom Cause
Water owing sound during operation. •Refrigerant ow inside the unit.
Operation is delayed a few minutes
after restarting�
•The delay is a protection for the compressor�
Outdoor unit emits water/steam� •Condensation or evaporation occurring in the pipes�
Steam comes out of the outdoor unit in
the heating mode�
•It is caused by defrost operation in the heat exchanger�
Outdoor unit does not operate� •It is caused by the protection control of the system when outdoor temperature is
out of the operating range�
System operation switches off� •It is caused by the protection control of the system� When the water inlet
temperature is lower than 10 °C, the compressor stops and the backup heater
power turns on�
System is hard to heat up� •When the panel and the oor are heated simultaneously, warm water temperature
may decrease, which may reduce the heating ability of the system�
•When the outdoor air temperature is low, the system may need longer time to heat
up�
•Discharge outlet or intake inlet in the outdoor unit is blocked by some obstacle,
such as a pile of snow�
•When the preset water outlet temperature is low, the system may need longer time
to heat up�
System does not heat up instantly� •System will take some time to heat up the water if it starts to operate at cold water
temperature�
Backup heater is automatically turned
ON when it is disabled�
•It is caused by the protection control of the indoor unit heat exchanger�
Operation starts automatically when
the timer is not set�
•Sterilization timer has been set�
Loud refrigerant noise continues for
several minutes�
•It is caused by protection control during deice operation at outdoor ambient
temperature lower than -10 °C�
*
1,
*
2
COOL mode is unavailable� •System has locked to operate in HEAT mode only�
Check the following before calling for servicing�
Symptom Check
Operation in HEAT/*
1,
*
2
COOL mode is
not working efciently.
•Set the temperature correctly�
•Close the panel heater/cooler valve�
•Clear any obstruction in the air inlet and air outlet vents of the outdoor unit�
Noisy during operation� •Outdoor unit or indoor unit has been installed at an incline�
•Close the cover properly�
System does not work� •Circuit breaker has tripped/activated�
Operation LED is not lit or nothing is
displayed on the Remote Controller�
•Power supply is working correctly, or a power failure has occurred�
*
1
The system is locked to operate without COOL mode� It can be unlocked only by authorised installers or our authorised service partners�
*
2
Only displayed when COOL mode is unlocked (This means when COOL mode is available)�
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