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▼ Refrigeration System
Unit produces no heat
The unit remains in continuous scanning mode.
Initial checks
Check the settings.
Are the data sent by the user interface received by the heat pump ?
Hydraulic unit
electronic circuit
sending data to
outdoor unit ?
Compressor
running ?
Operating pressure
OK ?
4-way valve
switching ?
Expansion correct ?
Inspect refrigeration
lines (clogging)
Hydraulic unit electronic system faulty
Inspect PCB
Charge to balance
Problem solved?
Servicing complete
Valve coil faulty ?
Change
expansion valve
Change coil
Change 4-way valve
after testing
No
Yes
No
Yes
Yes
No
No
No
No
Yes
Yes
No
Yes
Yes
Waterstage / Maintenance Manual / 2105 - EN