Midea MHC-96HWD1N1(A) Service Manual page 48

R410A Full DC Inverter Split Duct Type Technical Manual
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P5: Pipe temperature protection
P5: Pipe temperature protection
T3 port on main control board is loose
No
T3 sensor is short circuit or disabled
No
The indoor load is too large
No
The heat exchange of condenser
is not good. It may be caused by
dirty heat changer, abnormal ODU
fan running, ODU are too near to
each other, etc.
No
The high pressure side of the system is
blocked for squashed pipe, blocked
valve or closed stop valve
No
System contains air or nitrogen
No
Outdoor main control
board is damaged
47
Yes
Fasten the T3 port
Yes
Replace the sensor
Yes
Make sure the ratio of connectable
IDU is less than 130% or add ODU
Yes
Check the system and
fixed up the error
Make sure all valves are open,
Yes
check the system, and remove
the obstacle
Discharge the entire refrigerant. Then
Yes
vacuum the system and refill the refrigerant.
Add oil to the system if it leaks.
Replace the outdoor
main control board
MCAC-UTSM-201503