Midea MSH-07CRN1, MSH-07HRN1, MSH-09CRN1, MSH-09HRN1, MSH-12CRN1, MSH-12HRN1 - Page 304

11.1.10
Display LED STATUS
P3 Outdoor low temp. protection
This is optional, factory standard unit has not this function.
Unit stops when outdoor temp. is low than -15°C and lasting time more than 60 minutes, and unit runs
again when outdoor temp. more than -12°C.
Is the outdoor temp sensor right according to the table in clause 12
Yes
No
Replace the outdoor main board
Is the outdoor temp. low than -15°C?
11.1.11
Display LED STATUS
P4 Inverter compressor error
A
re the connectors CN6 and CN 11 right?
Yes
Yes
Yes
Is there +15 voltage between CN6
No
Replace inverter module
If the problem comes to again, check wingding resistance of inverter compressor, is it 0.64 ohm?
No
Replace inverter compressor
Replace outdoor main PCB
A
re the U,V,W connected to compressor and inverter module right?
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