Refrigeration & Air Conditioning Mechanic Red Seal · Question
An air conditioning unit's outdoor fan motor is running, but the compressor is not engaging. The contactor coil is energized. What is the first component to check?
If the contactor coil is energized but the compressor is not running, the most immediate check is for voltage across the main power contacts of the contactor. P
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Question: An air conditioning unit's outdoor fan motor is running, but the compressor is not engaging. The contactor coil is energized. What is the first component to check?
Answer options:
- Low pressure switch contacts
- Compressor winding resistance
- High pressure switch contacts ✅ Contactor main power contacts
Correct answer: Contactor main power contacts
Explanation: If the contactor coil is energized but the compressor is not running, the most immediate check is for voltage across the main power contacts of the contactor. Pitting or degradation of these contacts is a common failure point preventing power from reaching the compressor.
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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?
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