Midea R410A Full DC Inverter Split Type Series Technical Manual MCAC-UTSM-201406
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1) Check the voltage of DC generatrix, the normal value should be 510 to 580V. If the value is
less than 510V, go to next step.
2) Check the wiring connection of rectifier circuit, find out any loose in the circuit, and check
the filter board, single-phase rectifier stack, and three-phase rectifier stack. Note DC and
AC switch in the measurement.
3) If none of the above works, replace the PCB.
Module check
1) DC voltage between P and N should be 296V to 324V.
2) DC voltage between 1 and 2 should be 510V to 580V.
3) First adjust multi -meter to diode position, put the red pen on the 1 point (N terminal), put
black pen on the 3 or 4 or 5 point, the value should be approximate 0.378, if the value is
0, the IPM is broken. And then change the red pen to the 2 point (P terminal), the value
should be infinity, if the value is 0, the IPM is broken.
L0: Inverter module error
L8: Frequency difference in one second more than 15Hz protection
L9: Frequency difference between the real frequency and the setting frequency more than
15 Hz protection
Step 1: Replace the modular with correctly wire connection and start the system, if system is still
malfunction, then go to step2 to check the compressor.
Step 2: Take out the compressor from the malfunction system, short-circuit the suction and the
discharge, vacuum dry and charge 0.3kg~0.4kg R410A, and then connect the U,V,W
terminals to control box B which is took apart from normal system.
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