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Serving Austin, TX and surrounding areas since 1979


If Your Heat Pump Isn’t Heating, This Might Be Why

Heat pumps are well known for their ability to switch back and forth between heating and cooling modes. In fact, that’s often the reason that homeowners install them in the first place. This ability is granted by a part called the “reversing valve,” 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’s take a closer look at how the reversing valve functions, and the problems it may run into.

The Reversing Valve

The reversing valve is a four-way valve that sits in your heat pump’s 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 “solenoid.” When the heat pump switches modes, it activates the solenoid to pull the slide into the proper position.

Problems with the Reversing Valve

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’ll 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’s ability to switch between modes. You’ll need a technician to take care of it for you, though.

If your heat pump is in need of repairs, call Roznovak’s Services. We offer heat pump repair services throughout Taylor, TX. 

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