Which malfunction arises when an electronically commutated motor (ECM) overheats driving a heat pump compressor?

💡 Explanation

When an ECM driving a heat pump compressor overheats, demagnetization of the permanent magnets occurs because surpassing the Curie temperature reduces their magnetic field strength hindering torque generation. Therefore, demagnetization results, rather than brush wear, winding cracking or bearing failure, which arise from friction and contamination.

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