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R410A All DC Inverter V4+S Series 60Hz MCAC-VTSM-2015-09

152 Troubleshooting

If the values are normal, that means PCB has been malfunction, needs to be replaced, or else reinstall the wire

connection.

4) L8/L9 troubleshooting

Step 1: Compressor check

Measure the resistance between each two of U, V, W terminals of the compressor, all the resistance should be

the same and equal to 0.9~5 Ohms. (Fig. A and Fig. B)

Measure the resistance between each U, V, W terminal of the compressor and ground (Fig. C), all the

resistance should be infinite (Fig. D), if not the compressor has malfunctioned and needs to be replaced.

Fig. A

Fig.B

Fig.C

Fig.D

If the resistance values are normal, then go to step 2.

Step 2: Disconncet the power wiring from the compressor(named compressor A) of the faulted system(named

system A).

If there is a system running normally nearby (named system B):

Extend the power line of the inverter compressor of system B, connect compressor A to the control box of

system B, make sure that the U, V, W terminals are connected in right order, then start system B.

If compressor A can start normally, that means compressor is OK, the control box of system A has

malfunctioned, then replace the main PCB of system A and ensure correct wiring.

If compressor A can not start normally, that means compressor A is damaged and needs to be replaced.

System A

System B

If there is no normal system nearby:

Replace the main PCB of system A and ensure correct wiring, if compressor A can start normally, it means the

main PCB which was replaced was damaged. If compressor A still can’t start normally, replace the compressor.

Power line (U, V, W terminal)

Connect compressor A

to the control box of a

normal system B,

check whether

compressor A can start

normally

Midea MDV-280(10)W/D2DN1(B) User Manual

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