Pioneer YN020GMFI22M2D Service Manual page 53

8.4.2.4 E4 (Outdoor temperature sensor (coil sensor T3,ambient sensor T4, Compressor discharge
sensor T5、indoor coil outlet pipe sensor T2B) malfunction) diagnosis and solution
F1/F2/F3/F4/F5 (No.A,B,C,D,E Indoor unit coil outlet temp. sensor malfunction) diagnosis and
solution.
.
Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
Check the connections
between temperature
sensor and PCB. Are
the connections good?
Yes
Check the resistance value
of the sensor via Appendix 1
and Appendix 2
Is it normal?
No
Replace the sensor
E4/F1/F2/F3/F4/F5
If the sampling voltage is lower than 0.06V or higher than
4.94V, the LED will display the failure.
● Wiring mistake
● Sensor faulty
● PCB faulty
No Correct the connections.
Yes Replace indoor or outdoor PCB.