Refrigeration & Air Conditioning Mechanic Red Seal · Question
Upon arrival at a service call, a residential split system air conditioner is found to be running continuously but providing inadequate cooling. The outdoor unit's fan is not rotating, but the compressor is operating. What is the immediate diagnostic step?
If the compressor is running but the condenser fan is not, the most immediate step is to check the fan motor's power supply and capacitor. A failed capacitor is
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Question: Upon arrival at a service call, a residential split system air conditioner is found to be running continuously but providing inadequate cooling. The outdoor unit's fan is not rotating, but the compressor is operating. What is the immediate diagnostic step?
Answer options:
- Check the high-pressure safety switch
- Measure the current draw of the compressor ✅ Verify power to the condenser fan motor and check its capacitor
- Add refrigerant to the system
Correct answer: Verify power to the condenser fan motor and check its capacitor
Explanation: If the compressor is running but the condenser fan is not, the most immediate step is to check the fan motor's power supply and capacitor. A failed capacitor is a common cause of condenser fan motor failure, leading to high head pressure and reduced cooling.
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Question explanations
- 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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