Thermostat: As the brain of your system, this component should never be overlooked. 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. The Reversing Valve. If you notice the heat pump defrosting for an extended period of time, call a pro right away. The Reversing Valve. Second, the process should only take a few minutes. If the heat pump is in defrost mode, you will also need to make good use of your auxiliary heat. Heat Pump Stuck in Aux Heat Mode. The reversing valve is a 4-way valve that sits in the refrigerant line. 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. If your heat pump seems to be stuck in cooling mode, it’s probably because of a problem with your reversing valve. Here's what's happening when your heat pump seems stuck. Signs that your heat pump is in defrost mode include: Broken reversing valve: The reversing valve is the essential component of the heat pump for changing the system over from one mode to another. Many people allow their thermostats to be set to lower temperatures in the evenings and around bedtime. The mechanical valve can become stuck, however, and that will trap the system in whatever mode it’s currently operating in. Have a look at how the reversing valve operates, and how a problem with it can lock your system into cooling mode. Another common scenario is when the thermostat calls for a three-degree temperature rise . When this occurs the system can get stuck in ‘heating’ mode. I have a heat pump that seems to be stuck in heat mode. They’re self-automated, however, they can get stuck and prevent your heat pump from effectively switching to heating mode. 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 you try to turn the a/c on it runs heat. 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. If your heat pump isn’t cooling the air in your home, read on to find out why. Coronavirus Update: We care about your health and continue to service our customers safely. Could this be an electrical problem or is it probably the reversing valve? Having a heater that won't heat is a frustrating problem, for sure. Sometimes in heat pump systems, the reversing valve that switches the system from air conditioning to heating function gets stuck. 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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