1. The power management chip is faulty and needs to be replaced.
2. The power supply to the power management chip is insufficient or the power supply voltage is unstable. Check the power supply circuit.
3. The external circuit of the power management chip is incorrectly connected. Check the circuit connection.
4. Power management chip program error, need to re-write or update the program.
5. Other external factors interference, such as electromagnetic interference, need to be screened or eliminated interference.
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The reason is caused by excessive voltage, in life, if you find that the IC of your air conditioning board is burned out, which means that your voltage is unstable, and often expands, then in the case of excessive voltage, its heat consumption will be greater, this part of the heat will cause the IC worker to burn out