Heat Pump, Split System, Single Service, 3 phase
48 Maintenance Document 1394-1
4.2.2 Failures With No Error Code
Clear 35: No voltage on Hydraulic Unit
Probable causes:
• Power supply fault.
• External causes.
• Faulty electrical components.
Check:
1. Check the installation :
- Is the circuit breaker cut off?
- Check the wiring.
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:
If all of these checks are unsuccessful, replace Interface PCB.
OK
OK
OK
- Check that a voltage between AC 198 and AC 264 V exists between terminals 1 and 2 on the
Hydraulic Unit terminal block.
NO
- Check Interface PCB for :
o either the fuse (F1).
o or the varistor (VA1). Fault: overvoltage - external causes - power supply to be
checked).
- Replace the faulty component (if the varistor is blown, the PCB must be replaced).
YES
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