Midea MOBA30U-12HN1-Q Service Manual page 253

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 in bad ventilation
6. Refrigerant is leakage
e. Temperature sensor open or short circuit
Open or short circuit of
temperature sensor
Check the connections
between temperature
sensor and PCB. Are
the connections good?
Yes
Check the resistance value
of the sensor via Appendix 1
Is it normal?
No
Replace the sensor
Electrical Control
Is pressure protective switch K2 open
Possible reason
1. The wires is loose to K2
2. Air or other gas in the refrigerant.
3. Heat exchanger is dirty
4. Outdoor motor or fan blade is
defective
5. Outdoor unit is in bad ventilation
6. Refrigerant is too much
No Correct the connections.
Yes Replace indoor or outdoor PCB.
Yes
Troubleshooting
249