capacitor between P and Q of outdoor unit. Installation refers to Figure 6-2.1:
Figure 6-2.1: Indoor unit installation
Notes:
1.
Communication wires should be shield wire and indoor units should be connected in series.
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:
E4
PCB is loose
No
1
or failed
No
Yes
Ensure the sensor is connected properly
Yes
Replace the sensor
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