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2.7 E7: Discharge temperature sensor (T5) error (only for 28 model)
2.7.1 Digital display output
E7
2.7.2 Description
•
A compressor discharge pipe temperature sensor (T5) error.
•
The system stops running.
•
Error code is displayed on the outdoor unit PCB.
2.7.3 Trigger / recover condition
•
Trigger condition: Discharge temperature < 10
•
Recover condition: Discharge temperature go back to normal.
•
Reset method: Manually restart.
2.7.4 Possible causes
•
Temperature sensor not connected properly or has malfunctioned.
•
Damaged main PCB.
2.7.5 Procedure
Temperature sensor connection on main
Temperature sensor has short-circuited
The 4-way valve is abnormal (Air mixed
up or bad action phenomenon
The refrigerant is charged too much
The operation conditions of the unit
meets the operation requirement
（environment temperature, airflow of
the heat exchanger, etc.）
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.
2.
Air or nitrogen in the system causes discharge pressure to be higher than normal, compressor current to be higher than normal, discharge temperature to
be higher than normal, compressor makes noise, pressure meter do not display steady.
o
C for 5 minutes after compressor startup for 15 minutes.
E7
PCB is loose
No
or failed
1
No
2
).
No
No
Yes
Yes
Ensure the sensor is connected properly
Yes
Replace the sensor
Yes
Replace 4-way valve
Yes
Confirm the refrigerant's weight again
No
Belongs to the normal protection.
57
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