38MGR-04SM Specifications subject to change without notice. 43
DIAGNOSIS AND SOLUTION (CONT)
Open or short circuit of outdoor temperature sensor) diagnosis and solution F1/F2/F3/F4/F5 (open or
short circuit of indoor coil temperature sensor) diagnosis and solution (E4)
Troubleshooting
Fig. 51 — Check the Sensor Value
ERROR CODE E4/F1/F2/F3/F4/F5/F6
MALFUNCTION DECISION
CONDITIONS
If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure.
SUPPOSED CAUSES
• Wiring mistake
• Sensor faulty
• PCB faulty
Check the connections
between the temperature
sensor and PCB. Are
the connections good?
Correct the connections.
No
Yes
Yes Replace the indoor or outdoor PCB.
Replace the sensor.
Check the resistance value
of the sensors via
Appendices 1 and 2.
Is it normal?
No
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