MCAC-UTSM-201503 R410A Full DC Inverter Split Duct Type Technical Manual
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2) L1/L4 troubleshooting
Step 1: Check the DC voltage between 1 and 2 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 main PCB.
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