Power Transistor Thermistor Faulty or Disconnected

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The power transistor thermistor is faulty or disconnected (specific to FDCVA151-251 models), impacting temperature monitoring of the power transistors. This can lead to inverter damage from overheating.

• Disconnection of the power transistor thermistor.
• Open circuit fault in the power transistor thermistor sensor.
• Faulty power transistor thermistor indicating an incorrect temperature.

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1. 1

   Inspect the power transistor thermistor connection for dislodgement or damage, particularly on FDCVA151-251 models.

2. 2

   Measure the resistance of the thermistor to verify functionality and compare to the specified temperature-resistance chart.

3. 3

   Ensure the thermistor is securely connected to the inverter PCB and properly seated for accurate temperature sensing.