Troubleshooting
Electrical Control 249
d. Protection of pressure or temp.
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?
Correct the connections.No
Yes
Yes Replace indoor or outdoor PCB.
Replace the sensor
Check the resistance value
of the sensor via Appendix 1
Is it normal?
No
Protection of pressure or temp.
Is it k1 or K2 open ?
Is temp. protective switch K1 open
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
Is pressure protective switch K2 open
Yes
Yes
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 motor or fan blade is
defective
5. Outdoor unit is in bad ventilation
6. Refrigerant is too much
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