Midea CTBU-09HWFN1-M

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16.3.11 Outdoor IPM module temperature sensor malfunction diagnosis and solution (P7)
Error Code
P7
Malfunction conditions
If the sampling voltage is lower than 0.06V or higher than 4.94V,
the LED displays a failure.
Potential causes
● Wiring mistake
● Faulty sensor
● Faulty PCB
Trouble shooting:
Check the connection
between temperature
sensor and PCB. Is it
properly wired?
Ensure proper connectionNo
Yes
Replace outdoor main PCB
Measure the resistance
value of the sensor. Is it
within acceptable
parameters?
Replace the sensorNo
Yes
16.4 Main parts check
1. Temperature sensor checking
Disconnect the temperature sensor from PCB, measure the resistance value with a tester.
Temperature Sensors.
Room temp.(T1) sensor,
Indoor coil temp.(T2) sensor,
Outdoor coil temp.(T3) sensor,
Outdoor ambient temp.(T4) sensor,
Compressor discharge temp.(T5) sensor.
Measure the resistance value of each winding by using the multi-meter.