32
DIAGNOSIS AND SOLUTION (CONT)
E4/E5/F1/F2/F3 (Open circuit or short circuit of temperature sensor diagnosis and solution)
Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure.
Recommended parts to prepare:
S Wiring mistake
S Faulty sensor
S Faulty PCB
Troubleshooting and Repair:
Check the connection between
temperature sensor and PCB .
Replace indoor or outdoor PCB
Is it within acceptable
parameters?
Is it properly wired ?
Ensure proper connections .
NO
Measure the resistance value
of the sensor.
YES
Replace the Sensor.NO
YES
Fig. 22 – Multimeter
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