MCAC-UTSM-201406 Midea R410A Full DC Inverter Split Type Series Technical Manual
66
If the compressor start normally, that means compressor is OK, control box A is
malfunction, then check the inverter module.
If the compressor could not start normally, that means the compressor is malfunction,
the go to step 3 to check the compressor.
Step 3:
Check the compressor
Measure the resistance between each two of U, V, W terminals, all the resistance
should be the same and equal to 0.9~5 Ohms. (Fig. A and Fig. B)
Measure the resistance between each of U, V, W terminals to ground (Fig. C), all the
resistance should be the same and trend to be infinity (Fig. D), otherwise the
compressor has been malfunction, needs to be replaced.
Control box
A which is
took apart
from
malfunction
system.
Control box B
which is took
apart from
normal
system.
Compressor
which is
took apart
from
malfunction
system.
Fig. A
Fig. B
