38MBR: Service Manual
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26
Open Circuit or Short Circuit of Temperature Sensor Diagnosis and Solution (E4/E5/F1/F2/F3)
Troubleshooting
Fig. 22 — Test
Error Code E4/E5/F1/F2/F3
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
Check if the connecƟon between
the temperature sensor and PCB.
Is it wired properly?
Yes
Measure the resistance value of the sensor.
It is within acceptable parameters?
No
ŶƐƵƌĞĂƉƌŽƉĞƌĐŽŶŶĞĐƟŽŶ
No
Replace the sensor.
Yes
Replace the indoor or outdoor main PCB.
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