Carrier 38QUS012DS - Page 61

8
5 Open circuit or short circuit of temperature sensor diagnosis and solution (E4/E5/F1/F2/F3)
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
will display the failure.
Supposed causes ● Wiring mistake
● Sensor faulty
Check the connection
between temperature
sensor and PCB.
Correct the connectionNo
Yes
Replace indoor or outdoor
main PCB
Measure the resistance
value of the sensor
Repalce the sensorNo
Yes