How do you fix a stuck closed thermostat?

A thermostat controls your HVAC system’s functions by determining the amount of heat produced by the furnace.

It can get stuck in the on or off position and affect your HVAC unit’s normal function. When it does, you will need to fix it by first determining the causes for the sticking. A build-up of grease, debris, and dirt can cause your thermostat to get stuck. When your thermostat gets stuck in the closed position, your HVAC system will overheat since there won’t be any coolant circulation. To fix this, you should first turn the power to the HVAC system off. The next step is to remove the cover by following your manufacturer’s instructions. Brush and vacuum the thermostat carefully to remove dust and dirt from the contact point and lever switches. Wipe the two metal strips with a soft cloth and use a crisp dollar bill to remove dirt from the crevices. Then slip a 7/32″ wrench onto the hex nut below the bimetal while you hold the temperature adjustment lever in a stationary position. Turn the hex nut clockwise until you open the switch. Then adjust the lever to the lowest temperature setting. Replace the cover and wait for the temperature to stabilize before moving the temperature adjustment lever to correspond to the room temperature. Mount the thermostat in a place where the air is consistent with the room temperature. Regularly cleaning your home thermostat will help clear grime, dirt, and dust. It ensures your HVAC system runs well without any hiccups. Consult your HVAC technician to calibrate the thermostat if you cannot do it on your own. If the thermostat continues to fail despite regular cleaning and maintenance, you should get a replacement from your local HVAC supplier or get in touch with your HVAC repairman.

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