Midea MSV1-09HRDN1 - Page 39

Service manual
No
Does compressor operate?
35
13.1.10
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.
13.1.11
Display LED STATUS
P4 Inverter compressor error
Is refrigerant circulation volume normal?
Gas charging
Is abnormality the same after gas charging
Check refrigerant system (such as clogging of
ill t )
Is protector normal?
Check the outdoor main PCB
Replace protector
No
Yes
Yes
No
No
Is the outdoor temp. low than -15°C?
Is the outdoor temp sensor right according to the table in clause 12
Replace the outdoor main board
No
Yes
Is the connection good?
Yes
No
Connect and test again.
Replace the outdoor main PCB.
A
re the U,V,W connected to compressor and inverter module right?
A
nd is the com
p
ressor feed back wires
(
CN514）connected to PCB
g
ood.？
No