OUT-57
DUAL, TRIPLE, POKER DC Inverter : 3. Outdoor Unitis & Troubleshooting
Multi Liberty
DC Inverter
Outline of malfunction
Intervention of a protection on Inverter Module (IPM)
OPERATION
TIMER
DEF./FAN
Flashing
OFF
OFF
ALARM
ON
• Troubleshooting by LED indicators of Multi Liberty (HTFU, HSFU, HRBU) X Indoor Unit
Check the connections on P4(-), P2(+) connectors of Outdoor Unit’s main PCB:
are they OK?
Is Outdoor Unit’s power supply voltage 220-240V?
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
NO
Replace Outdoor Unit’s main PCB.
YES
Correct connections on
connectors and make power
supply voltage correspond to the
system’s operation specifications.
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
.