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VRF 50/60Hz
2.4 E4: Temperature sensor (T3/T4) fault (For all models)
2.4.1 Digital display output
E4
2.4.2 Description
•
Outdoor heat exchanger temperature sensor (T3) error or outdoor ambient temperature sensor (T4) error.
•
The system stops running.
•
Error code is displayed on the outdoor unit PCB.
2.4.3 Trigger / recover condition
•
Trigger condition: The main control board cannot receive the feedback signal of temperature sensor T3 or T4.
•
Recover condition: The main control board can receive the feedback signal of temperature sensor T3 or T4.
•
Reset method: Resume automatically.
2.4.4 Possible causes
•
Temperature sensor not connected properly or has malfunctioned.
•
Temperature sensor port connect to the main board connecter is loose.
•
Damaged main PCB.
2.4.5 Procedure
Temperature sensor connection on main
Temperature sensor has short-circuited
Replace outdoor main PCB
Notes:
1.
Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor's resistance
characteristics table, the sensor has failed.
54
E4
PCB is loose
No
or failed
1
No
Yes
Ensure the sensor is connected properly
Yes
Replace the sensor
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