With the weather warming up as spring starts, heat pumps are going to shift over into cooling mode—and will probably stay there for many months ahead, all the way through the summer. If you haven’t needed to turn your heat pump on for a stretch during the mild winter, you may discover that it isn’t blowing out the cool air that you want from it when the time finally comes to turn it on. In fact, it might still be sending out heated air.
In most cases, this is a repair issue that needs to have HVAC professionals look into it. Sometimes it might be a simple error with the thermostat settings, so before calling your local contractor to fix the problem, see that you’ve set the thermostat correctly.
There are a number of different reasons why a heat pump may become trapped in heating mode. Most of the time, it comes down to one of two different problems:
A broken reversing valve
The reversing valve is the essential component for a heat pump that allows it to switch between working as a heater and an air conditioner. The valve is attached to the refrigerant line as it leaves the compressor, and depending on the setting of a slide in the valve, it will send the refrigerant in one of two directions. This determines whether the heat pump is in heating or cooling mode. If the valve should become stuck, the heat pump will not be able to change from one mode to another. The best solution to this problem is to have technicians remove the valve and put in a new one.
Lost thermostat connection
The problem could lie in the thermostat, but not because of a mistake in setting it. The thermostat controls the reversing valve, so if the thermostat loses its connection to the valve, it will not be capable of making the heat pump change from one mode to another. Technicians can either repair the thermostat or recommend putting in a replacement thermostat.
Call on JW Heating and Air when you need heat pump repairs in Downey, CA and throughout the Greater Los Angeles, San Fernando, and San Gabriel Valley areas.