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Procedure
The condenser heat exchange is poor
The high pressure side is blocked, caused
by crushed or bent pipe or blocked EXV
Inverter module has short‐circuited
Compressor has malfunctioned
Replace outdoor main PCB
Notes:
1.
In heating mode check water side heat exchanger, water piping, circulator pumps and water flow switch for dirt/blockages. In cooling mode check air side
heat exchanger, fan and air outlets for dirt/blockages.
2.
High pressure side blockage causes discharge temperature to be higher than normal, discharge pressure to be higher than normal and suction pressure to
be lower than normal.
3.
Set a multi‐meter to buzzer mode and test any two terminals of P N and U V W of the inverter module. If the buzzer sounds, the inverter module has
short‐circuited.
4.
The normal resistances of the inverter compressor are 0.7‐1.5Ω among U V W and infinite between each of U V W and ground. If any of the resistances
differ from these specifications, the compressor has malfunctioned.
201909 65
P3
No
1
No
2
No
3
No
4
No
Midea CAC Confidential
Yes
Inspect the system and fix the error
Yes
Inspect the system and fix the error
Yes
Replace the inverter module
Yes
Replace the compressor
M‐Thermal Split
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