OUT-89
DUAL, TRIPLE, POKER DC Inverter : 3. Outdoor Unitis & Troubleshooting
Multi Liberty
DC Inverter
Check connections on P4(-), P2(+)
connectors on Outdoor Unit’s main PCB: are
they OK?
Is power supply voltage (measure it) on
Outdoor Unit 220-240V?
Correct connections on
connectors and make power
supply voltage correspond to the
system’s operation specifications.
NO
Are wirings to compressor well connected?
Are wirings broken?
YES
Disconnect wirings from compressor, then try
to restart system.
Is Protection Code displayed again?
YES
Inspect compressor.
- Start system in Cooling mode or in Heating mode,
according to the season.
- By using a Tester, measure voltage on each wiring
to compressor; if wirings are energized, but
compressor does not start, compressor is faulty
and it is necessary to replace it.
- Measure resistance on compressor’s terminals.
Normally, the detected values must be the
following:
Between U(R) and V(S): 1
Ω
.
Between U(R) and W(C): 1
Ω
.
Between V(S) and W(C): 1
Ω
.
NO
Replace Outdoor Unit’s main PCB.
YES
Intervention of a protection function on Inverter Module
P 4
Outline of protection function
• Troubleshooting flowcharts, referred to Protection Codes displayed on Outdoor Unit:
Protection Code on Outdoor Unit
The display shows
“
P4”.