Refrigeration & Air Conditioning Mechanic Red Seal · Question
A technician is troubleshooting a split-system air conditioner. The outdoor fan motor hums loudly but does not start. Power is confirmed to be present at the motor terminals. Which component is the most likely cause of this symptom?
A common symptom of a failed or weak run capacitor in a single-phase motor is a humming sound without starting, as the capacitor is responsible for creating the
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Question: A technician is troubleshooting a split-system air conditioner. The outdoor fan motor hums loudly but does not start. Power is confirmed to be present at the motor terminals. Which component is the most likely cause of this symptom?
Answer options: ✅ The run capacitor
- The thermostat
- The contactor coil
- The high-pressure switch
Correct answer: The run capacitor
Explanation: A common symptom of a failed or weak run capacitor in a single-phase motor is a humming sound without starting, as the capacitor is responsible for creating the phase shift needed for the motor to generate a rotating magnetic field.
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- Which of the following refrigerants is a hydrofluorocarbon (HFC) and has a high ozone depletion potential (ODP
- Which component is responsible for compressing the refrigerant vapour to a high pressure and temperature?
- According to the Canadian Electrical Code (CEC), what is the minimum required working clearance in front of el
- What is the main operating characteristic difference between a fixed orifice (capillary tube) and a Thermostat
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