Split system (Single phase and 3-phase type)
Maintenance Document 1544-1 43
3.1.3 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
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