The reversing valve is a 4-way valve that sits in the refrigerant line. Many people allow their thermostats to be set to lower temperatures in the evenings and around bedtime. Coronavirus Update: We care about your health and continue to service our customers safely. The Reversing Valve. 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. 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. 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. 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. The mechanical valve can become stuck, however, and that will trap the system in whatever mode it’s currently operating in. Heat Pump Stuck in Aux Heat Mode. I have a heat pump that seems to be stuck in heat mode. Thermostat: As the brain of your system, this component should never be overlooked. If your heat pump isn’t cooling the air in your home, read on to find out why. 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. They’re self-automated, however, they can get stuck and prevent your heat pump from effectively switching to heating mode. When you try to turn the a/c on it runs heat. 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. Another common scenario is when the thermostat calls for a three-degree temperature rise . Having a heater that won't heat is a frustrating problem, for sure. If your heat pump seems to be stuck in cooling mode, it’s probably because of a problem with your reversing valve. Signs that your heat pump is in defrost mode include: One of those problems is becoming stuck in one mode or another. Could this be an electrical problem or is it probably the reversing valve? When this occurs the system can get stuck in ‘heating’ mode. 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