Carrier 38MBRQ48A-3 - IPM Module Temperature Sensor Malfunction (P7) Diagnosis; Troubleshooting IPM Module Temperature Sensor Issues

38MBR: Service Manual
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Outdoor IPM Module Temperature Sensor Malfunction Diagnosis and Solution (P7)
Troubleshooting
Error Code P7
Malfunction decision conditions If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays a failure.
Supposed Causes
•Faulty wiring
•Faulty sensor
ŚĞĐŬƚŚĞĐŽŶŶĞĐƟŽŶďĞƚǁĞĞŶƚŚĞ
temperature sensor and the PCB.
/ƐŝƚƉƌŽƉĞƌůLJǁŝƌĞĚ
Measure the sensor’s resistance value.
/ƐŝƚǁŝƚŚŝŶĂĐĐĞƉƚĂďůĞƉĂƌĂŵĞƚĞƌƐ
Yes
Yes
ŶƐƵƌĞĂƉƌŽƉĞƌĐŽŶŶĞĐƟŽŶNo
Replace the sensor.
No
Replace the outdoor main PCB.