Midea MOU-12HN1 User Manual page 125

MCAC-UTSM-2008-11
d. Protection of pressure or temp.
Protection of pressure or temp.
Yes
Is it k1 or K2 open ?
Is temp. protective switch K1 open
Yes
Possible reason
1. The wires is loose to K1
2. Air or other gas in the refrigerant.
3. Heat exchanger is dirty
4. Outdoor fan or fan blade is defective
5. Outdoor unit is bad ventilation
6. Refrigerant is leakage
7. K1 switch is defective
e. Open-circuit and short-circuit trouble of T3
Is connection to connector of temp. sensor good?
Yes
Check the resistance of the temp. sensor according to Annex 1
Is it the resistance is normal?
Yes
Indoor PCB is defective.
Outdoor Units
Is pressure protective switch
Yes
Possible reason
1. The wires is loose to K2
2. Air or other gas in the refrigerant.
3. Heat exchanger is dirty
4. Outdoor fan or fan blade is defective
5. Outdoor unit is bad ventilation
6. Refrigerant is two much
7. K2 switch is defective
No
Replace the sensor
Troubleshooting
K2 open
No
Repair connector
123