108
Troubleshooting (Cont.)
Solving steps for typical malfunction (Cont.)
For outdoor unit (Cont.)
d. Protection of pressure or temp.
e. Open-circuit and short-circuit trouble of T3
Is connection to connector of temp. sensor good?
Is it the resistance is normal?
Yes
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 bad ventilation
6. Refrigerant is leakage
7. K1 switch is defective
Yes
Is pressure protective switch K2 open
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 fan or fan blade is defective
5. Outdoor unit is bad ventilation
6. Refrigerant is too much
7. K2 switch is defective
No
Repair connector
Check the resistance of the temp. sensor according
to Annex 1
Yes
Indoor PCB is defective.
No
Replace the sensor
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