Midea R410A Full DC Inverter Split Type Series Technical Manual MCAC-UTSM-201406
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L1: DC generatrix low voltage error
L4: MCE error/ synchronization/ closed loop
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
wires. If wires are OK, replace the PCB.
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