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Q.

Why My AC Unit Humming But Not Running?

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35 days

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0 2025-06-17T10:25:21+00:00

Last summer, I noticed my air conditioner was humming nonstop, but the compressor nor the fan was not switching on. I hired an AC technician to fix this issue, and learned that the problem was with the capacitor. The capacitor aids in starting the fan and compressor. If it malfunctions, the motor won't receive the power it needs, making a humming noise.

Why is My Air Conditioner Humming But Not Running?

Apart from faulty capacitor, I also learned a few more reasons that can make an air conditioner hum while not switching on:

  1. Tripped Circuit Breaker: When a circuit breaker trips, the power supply is cut off, which makes the device hum without switching on.

  2. Compressor Malfunction: When a locked or damaged compressor tries to start but fails, it may hum.

  3. Problems with the Contactor: A worn-out contactor may hum but fail to supply the motor with power.

  4. Debris or obstructions: In the fan or motor assembly, foreign objects may produce humming and hinder operation.

Switch off your air conditioner and contact a technician if it is buzzing but not operating. Ignoring it could lead to internal component damage and higher repair expenses.

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