OUT-49
DUAL, TRIPLE, POKER DC Inverter : 3. Outdoor Unitis & Troubleshooting
Multi Liberty
DC Inverter
P 4
Intervention of a protection function of Inverter Module
Protection Code on Indoor Unit
Outline of Protection function
• Troubleshooting for Protection Codes shown on Display of Multi Liberty HKEU X Indoor Units
Check connections on P4(-), P2(+) connectors of Outdoor Unit’s main PCB: are
they OK?
Is power supply voltage (measure it) on Outdoor Unit is 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 the system. Is Code “P4” displayed
again?
YES
Inspect compressor.
- Start the system in Cooling mode or in Heating
mode, according to the season.
- By using a Tester, measure the voltage on each
compressor’s wiring; if wirings are energized, but
compressor does not start, compressor is faulty
and it is necessary to replace it.
- Measure the resistance on the 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.
SÌ