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201703
L4 troubleshooting
4.20.8
Situation 1: L4 error appears immediately after the outdoor unit is powered-on
L4
Replace the main PCB
Situation 2: L4 error appears after the compressor has been running for a period of time and the compressor speed is 20
- 30 rps
L4
Contactor has failed
1
Yes
Replace the contactor
No
Replace the main PCB
Notes:
1.
Check the voltage between the two wires which connect the contactor with the outdoor unit main PCB. If the voltage is 220V AC and the contactor is open,
the contactor has failed.
Condition 3: L4 error appears after the compressor has been running for a period of time and the compressor speed is
over 60rps
L4
Compressor is over-current
2
Yes
Replace the compressor
No
Replace the main PCB
Notes:
1.
Re-start the unit, use clip-on ammeter to measure the compressor current, if the current is normal indicates the compressor is failed, if the current is
abnormal indicates the main PCB is failed.
MUNDOCLIMA AEROTHERM V17 - BIBLOC
