Another common scenario is when the thermostat calls for a three-degree temperature rise . 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. Could this be an electrical problem or is it probably the reversing valve? 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. 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. 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). The Reversing Valve. Heat Pump Stuck in Aux Heat Mode. Having a heater that won't heat is a frustrating problem, for sure. One of those problems is becoming stuck in one mode or another. Thermostat: As the brain of your system, this component should never be overlooked. 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. Here's what's happening when your heat pump seems stuck. 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. Broken reversing valve: The reversing valve is the essential component of the heat pump for changing the system over from one mode to another. I have a heat pump that seems to be stuck in heat mode. Luckily, this part can be easily swapped out by a pro. The Reversing Valve. If your heat pump seems to be stuck in cooling mode, it’s probably because of a problem with your reversing valve. Coronavirus Update: We care about your health and continue to service our customers safely. 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 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. 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. The mechanical valve can become stuck, however, and that will trap the system in whatever mode it’s currently operating in. Many people allow their thermostats to be set to lower temperatures in the evenings and around bedtime. When your heat pump experiences issues, it might not be a problem with the actual system at all but rather with your thermostat. 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