Refrigeration System - Fujitsu WATERSTAGE WOYG160LJL Maintenance Document

▼ 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 ?
Waterstage / Maintenance Manual / 2105 - EN
Hydraulic unit
electronic circuit
sending data to
outdoor unit ?
Yes
Compressor
running ?
Yes
Operating pressure
OK ?
Yes
4-way valve
switching ?
Yes
No
Expansion correct ?
Yes
expansion valve
Inspect refrigeration
lines (clogging)
No
Hydraulic unit electronic system faulty
No
Inspect PCB
No
Charge to balance
No
Problem solved?
No
Valve coil faulty ?
Change
No
Change 4-way valve
after testing
Yes
Servicing complete
Yes
Change coil
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