If your heat pump seems to be stuck in cooling mode, it’s probably because of a problem with your reversing valve. The Reversing Valve. The Reversing Valve. If your heat pump seems to be stuck on auxiliary heat mode and the temperatures outside are above 35 degrees, you should call the professionals at Precision Heating & Air. Thermostat: As the brain of your system, this component should never be overlooked. If you notice the heat pump defrosting for an extended period of time, call a pro right away. They’re self-automated, however, they can get stuck and prevent your heat pump from effectively switching to heating mode. The reversing valve is a 4-way valve that sits in the refrigerant line. Here's what's happening when your heat pump seems stuck. When this occurs the system can get stuck in ‘heating’ mode. If the heat pump is in defrost mode, you will also need to make good use of your auxiliary heat. And, because a heat pump stops heating your home during this process, some models will automatically switch to AUX mode until the defrost cycle is over. I have a heat pump that seems to be stuck in heat mode. Luckily, this part can be easily swapped out by a pro. Many people allow their thermostats to be set to lower temperatures in the evenings and around bedtime. Have a look at how the reversing valve operates, and how a problem with it can lock your system into cooling mode. If your heat pump isn’t cooling the air in your home, read on to find out why. Heat Pump Stuck in Aux Heat Mode. Second, the process should only take a few minutes. Could this be an electrical problem or is it probably the reversing valve? I got the a/c to run by cycling the power a couple of times but after having to use the heat again, it is stuck again. Signs that your heat pump is in defrost mode include: When that happens, the heat pump will reverse the flow of refrigerant so that hot refrigerant is sent to the outdoor unit (to melt the ice). When your heat pump experiences issues, it might not be a problem with the actual system at all but rather with your thermostat. Sometimes in heat pump systems, the reversing valve that switches the system from air conditioning to heating function gets stuck. When you try to turn the a/c on it runs heat. Having a heater that won't heat is a frustrating problem, for sure. Broken reversing valve: The reversing valve is the essential component of the heat pump for changing the system over from one mode to another. Heat pumps are constructed very much like air conditioners, with one major exception: the reversing valve. The mechanical valve can become stuck, however, and that will trap the system in whatever mode it’s currently operating in. 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