The mechanical valve can become stuck, however, and that will trap the system in whatever mode it’s currently operating in. The Reversing Valve. Heat Pump Stuck in Aux Heat Mode. The Reversing Valve. Coronavirus Update: We care about your health and continue to service our customers safely. 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. Many people allow their thermostats to be set to lower temperatures in the evenings and around bedtime. Second, the process should only take a few minutes. Have a look at how the reversing valve operates, and how a problem with it can lock your system into cooling mode. 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. The reversing valve is a 4-way valve that sits in the refrigerant line. 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. Luckily, this part can be easily swapped out by a pro. When the user presses the “change mode” button on the device, an electrical signal is sent to the solenoid in the valve; this part activates the sliding mechanism, and then it makes sure the refrigerant passes through the valve to the desired place so it can either cool or heat depending on the selected mode. Having a heater that won't heat is a frustrating problem, for sure. 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. Signs that your heat pump is in defrost mode include: If you notice the heat pump defrosting for an extended period of time, call a pro right away. Could this be an electrical problem or is it probably the reversing valve? Thermostat: As the brain of your system, this component should never be overlooked. Here's what's happening when your heat pump seems stuck. 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. 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). If your heat pump seems to be stuck in cooling mode, it’s probably because of a problem with your reversing valve. They’re self-automated, however, they can get stuck and prevent your heat pump from effectively switching to heating mode. If the heat pump is in defrost mode, you will also need to make good use of your auxiliary heat. 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