Refrigeration & Air Conditioning Mechanic Red Seal · Question
During a seasonal startup, a heat pump operating in heating mode is producing cool air from the registers. The outdoor unit fan is running, and the compressor is operating. What is the most likely initial component to check?
If the heat pump is running in heating mode but delivering cool air, it strongly suggests the reversing valve has failed to shift, or is stuck in the cooling po
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Question: During a seasonal startup, a heat pump operating in heating mode is producing cool air from the registers. The outdoor unit fan is running, and the compressor is operating. What is the most likely initial component to check?
Answer options:
- The indoor fan motor ✅ The reversing valve
- The defrost control board
- The outdoor coil temperature sensor
Correct answer: The reversing valve
Explanation: If the heat pump is running in heating mode but delivering cool air, it strongly suggests the reversing valve has failed to shift, or is stuck in the cooling position. This prevents the hot refrigerant gas from flowing to the indoor coil.
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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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