Heat pumps are well known for their ability to switch back and forth between heating and cooling modes. In fact, that\u2019s often the reason that homeowners install them in the first place. This ability is granted by a part called the \u201creversing valve,\u201d which directs the flow of refrigerant through the system. If the valve develops problems, though, your heat pump may suddenly be unable to switch between modes. If your heat pump seems to be stuck in the air conditioning mode this winter, a reversing valve issue is probably the cause. Let\u2019s take a closer look at how the reversing valve functions, and the problems it may run into.<\/p>\n
The reversing valve is a four-way valve that sits in your heat pump\u2019s refrigerant line. Inside it is a slide that moves between two positions to change the refrigerant flow. The slide is controlled by an electromagnet called the \u201csolenoid.\u201d When the heat pump switches modes, it activates the solenoid to pull the slide into the proper position.<\/p>\n
There are two main problems that can affect your reversing valve: a stuck slide or a dead solenoid. If the slide becomes stuck, it will be unable to direct the flow of refrigerant and the heat pump will become stuck in one mode. The same will happen if the solenoid dies. To fix a stuck slide, you\u2019ll need to have an HVAC technician open the valve and reset it. If the solenoid loses its charge, though, the only thing to do is replace it. That should restore your heat pump\u2019s ability to switch between modes. You\u2019ll need a technician to take care of it for you, though.<\/p>\n