Midea MOB2-12HN1-QC2 - Page 61

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9.2.2 Open circuit or short circuit of temperature sensor diagnosis and solution
Check the connections
between temperature
sensor and PCB. Are
the connections good?
Correct the connections.
No
Yes
Yes Replace indoor or outdoor PCB.
Replace the sensor and
check if the problem
happen again?
9.2.3 Over current protection occurs 4 times diagnosis and solution
No
Correct the operation condition.
Check if the voltage of the
power supply is too low
?
Yes
Repair the power supply.
Is the outdoor
operation temperature
too high? Does the
outdoor unit has bad
air circulation?
Yes
No
Check if the outdoor
fan can run properly?
No
Correct the connection of fan
motor or replace the fan motor.
Yes
Yes
Check if the compressor
is normal running
No
Replace the
compressor
Yes
Replace the capillary.
Evacuate the system
and recharge refrigerant.
Disconnect with the power
and replace the main PCB.
Turn on the units and check
if the problem remains