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. They’re self-automated, however, they can get stuck and prevent your heat pump from effectively switching to heating mode. Thermostat: As the brain of your system, this component should never be overlooked. 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. 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. If your heat pump seems to be stuck in cooling mode, it’s probably because of a problem with your reversing valve. Luckily, this part can be easily swapped out by a pro. Have a look at how the reversing valve operates, and how a problem with it can lock your system into cooling mode. Sometimes in heat pump systems, the reversing valve that switches the system from air conditioning to heating function gets stuck. When this occurs the system can get stuck in ‘heating’ mode. Could this be an electrical problem or is it probably the reversing valve? The defrost mode light stays on constantly: First, the heat pump shouldn’t even go into defrost mode unless the outside unit is covered in snow or ice. I have a heat pump that seems to be stuck in heat mode. 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. When you try to turn the a/c on it runs heat. The reversing valve is a 4-way valve that sits in the refrigerant line. One of those problems is becoming stuck in one mode or another. When your heat pump experiences issues, it might not be a problem with the actual system at all but rather with your thermostat. Heat Pump Stuck in Aux Heat Mode. Here's what's happening when your heat pump seems stuck. The mechanical valve can become stuck, however, and that will trap the system in whatever mode it’s currently operating in. If your heat pump isn’t cooling the air in your home, read on to find out why. 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. Heat pumps are constructed very much like air conditioners, with one major exception: the reversing valve. Coronavirus Update: We care about your health and continue to service our customers safely. The Reversing Valve. 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). 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