Carrier 12K - Open-Circuit and Short-Circuit Trouble of T4; High Temperature Protection of Condenser

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Troubleshooting (Cont.)
Solving steps for typical malfunction (Cont.)
For outdoor unit (Cont.)
f. Open-circuit and short-circuit trouble of T4
g. High temperature protection of condenser
High temperature protection of condenser
Possible reason
1. Air or other gas in the refrigerant.
2. Outdoor coil is dirty
3. Outdoor fan or fan blade is defective
4. Outdoor unit is bad ventilation
5. Refrigerant is leakage
6. Outdoor PCB is defective
Yes
Is connection to connector of temp. sensor good?
Check the resistance of the temp. sensor according to Annex 1
Is it the resistance is normal?
Yes
Yes
No
Repair connector
Check the resistance of the temp. senso
r
according to Annex 1, is it normal?
No
Replace the sensor
No
Replace the sensor
Indoor PCB is defective.