Refrigeration & Air Conditioning Mechanic Red Seal · Question
A residential heat pump operates in heating mode. The reversing valve solenoid coil is energized, but the pressure and temperature readings indicate that the outdoor coil is acting as the evaporator and the indoor coil as the condenser. If the system fails to switch to cooling mode when commanded, what is a potential cause related to the reversing valve?
If the reversing valve solenoid is energized (meaning it is receiving the electrical signal to switch modes), but the system's pressures and temperatures remain
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Question: A residential heat pump operates in heating mode. The reversing valve solenoid coil is energized, but the pressure and temperature readings indicate that the outdoor coil is acting as the evaporator and the indoor coil as the condenser. If the system fails to switch to cooling mode when commanded, what is a potential cause related to the reversing valve?
Answer options: ✅ The reversing valve's slide piston is mechanically stuck, despite the solenoid's activation.
- The thermostat's 'O' terminal is not sending a 24V signal to the reversing valve solenoid.
- The outdoor fan motor is seized, preventing heat rejection.
- The indoor coil's thermostatic expansion valve (TXV) is stuck open.
Correct answer: The reversing valve's slide piston is mechanically stuck, despite the solenoid's activation.
Explanation: If the reversing valve solenoid is energized (meaning it is receiving the electrical signal to switch modes), but the system's pressures and temperatures remain in heating mode, it indicates a mechanical failure within the valve itself, such as a stuck slide piston, preventing the refrigerant flow from reversing.
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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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