Midea V4 Plus S Series - L1;L4 Troubleshooting; L2 Troubleshooting

MCAC-VTSM-2015-09 R410A All DC Inverter V4+S Series 60Hz
Troubleshooting 151
2) L1/L4 troubleshooting
Step 1: Check the DC voltage between terminal 1 and 2, the normal value should be 270V~360V, if the voltage
is lower than 270V, go to step 2.
Step 2: Check for rectifier wiring circuit. If wires are loose, fasten the wires. If wires are OK, replace the main
PCB.
3) L2 troubleshooting
Step 1: Check the DC voltage between terminal 1 and 2, the normal value should be 270V~360V, if the voltage
is higher than 360V, go to step 2.
Step 2: Check the voltage between P、+15V and N terminal on PCB, the normal value between P and N should
be 1.4 times the rated voltage, the normal value between +15V and N should be 15V. If the values are normal,
that means PCB has been malfunction, needs to be replaced, or else reinstall the wire connection.
1
2
3-Phase
bridge rectifier
Filter board
1
2