Refrigeration & Air Conditioning Mechanic Red Seal · Question
A technician is troubleshooting a heat pump operating in heating mode. The reversing valve's solenoid coil activates, but the compressor discharge line remains hot while the suction line is cold, and no heat is being delivered to the conditioned space. What is the most likely issue?
If the heat pump is attempting to heat but the reversing valve is stuck in the cooling position, the outdoor coil will be functioning as the condenser (hot disc
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Question: A technician is troubleshooting a heat pump operating in heating mode. The reversing valve's solenoid coil activates, but the compressor discharge line remains hot while the suction line is cold, and no heat is being delivered to the conditioned space. What is the most likely issue?
Answer options: ✅ The reversing valve is stuck in the cooling position.
- The reversing valve solenoid coil is faulty and not energized.
- The outdoor fan motor is operating in reverse.
- There is a refrigerant overcharge, causing high head pressure.
Correct answer: The reversing valve is stuck in the cooling position.
Explanation: If the heat pump is attempting to heat but the reversing valve is stuck in the cooling position, the outdoor coil will be functioning as the condenser (hot discharge, cold suction entering indoor coil), and no heat will be transferred to the indoor air. This prevents heating operation despite the solenoid attempting to switch modes.
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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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