Midea VRF V4 Plus I Series - L1;L4 Troubleshooting; L2 Troubleshooting

MCAC-VTSM-2014-04 R410A DC Inverter V4 Plus 50Hz
Troubleshooting 111
5.14.2 L1/L4 troubleshooting
Step 1: Check the DC voltage between P and N terminal, the normal value should be 510V~580V, if the
voltage is lower than 510V, go to step 2.
Step 2: Check whether the wires of rectifier circuit are loose or not. If wires are loosen, fasten the wires. If
wires are OK, replace the PCB.
5.14.3 L2 troubleshooting
Step 1: Check the DC voltage between P and N terminal, the normal value should be 510V~580V, if the
voltage is higher than 580V, go to step 2.
Step 2: Check the voltage between two electrolytic capacitors, the normal value should be 510V±30V or
310V±30V, if not in the range then the Main board has malfunction, it needs to be replaced.
3-Phase
rectifier stack
Single-Phase
rectifier stack
Filter
board
Turn the measure
range of the meter to
1kV and measure the
voltage between two
electrolytic capacitors