Fujitsu WATERSTAGE 112 Maintenance Document page 49

Heat Pump, Split System, Single Service, 3 phase
Clear 36: No voltage on outdoor unit
Probable causes:
•
Power supply fault.
•
External cause.
•
Faulty electrical components.
Check:
2. Check for external causes on the Hydraulic Unit and outdoor unit (noise or voltage drop) :
Check for any other electrical device on the same electric circuit which might cause a drop in
-
voltage.
Check for any current leaks.
-
Check for any equipment generating electromagnetic waves which interfere with the
-
communication between the Hydraulic Unit and the outdoor unit.
3. Check the electrical components:
Check that a voltage between AC 198 and AC 264 V exists between terminals 1 and 2 on the
-
Hydraulic Unit terminal block.
Check Main PCB (power supply) for :
-
either the fuse (F1, F3).
o
or the varistor (VA1-VA5). Fault: overvoltage - external causes - power supply to be
o
checked).
Replace the faulty component (if the varistor is blown, the PCB must be replaced).
-
If all of these checks are unsuccessful, replace Filter PCB, Main PCB,
Inverter PCB and PFC PCB.
Maintenance Document 1394-1
1. Check the installation
- Is the circuit breaker cut off?
- Check the wiring.
YES
OK
OK
OK
NO
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