If it is not, the thermostat cannot signal the air conditioner to cycle on. The Air Conditioner Suddenly Stops WorkingĬheck whether the thermostat’s display is lit. Learning how to troubleshoot these issues can help you avoid an unnecessary and costly service call. Since the system’s functionality is affected, it is easy to misinterpret the symptoms as urgent HVAC equipment troubles when a simple fix at the thermostat may be all that is needed.Ī faulty thermostat may be to blame if the air conditioner short cycles and runs almost nonstop, the living space seems warmer than your desired temperature setting, or you suddenly experience a cooling system failure. Most thermostat malfunctions cause subtle or sudden changes in the performance of your cooling system. When thermostat problems develop, they are rarely dramatic events with sparks flying, or where smoke alarms sound. Minor thermostat problems can mimic more serious issues with the HVAC system and directly impact cooling system performance and comfort. Any change in air conditioner performance is worrisome, but before calling a cooling expert, check the thermostat. A well-functioning air conditioner is essential for home comfort in Sarasota’s hot, humid climate. For more information about thermostats and other HVAC topics, download our free Home Comfort Resource guide. Our goal is to help educate our customers in Cleveland, Ohio about energy and home comfort issues (specific to HVAC systems). If this doesn’t work, it may be time to upgrade to a programmable thermostat.įor expert help troubleshooting thermostat problems in your northeast Ohio home, contact the pros at Stack Heating & Cooling. Another possibility is an improperly calibrated anticipator. You may be able to lengthen the cycle by adjusting the anticipator lever one notch at a time toward the word “longer” on the dial. It may need to be moved if it’s exposed to heat sources, direct sunlight or drafts or installed far from the main living areas.Īn off-kilter or dirty thermostat can cause this, so troubleshoot those issues first. If these fixes don’t work, consider the thermostat’s location. Locate the arm that’s attached to a round dial and try gently pushing it either direction to get it unstuck. If you have a mechanical thermostat, a frozen anticipator is another potential culprit. To fix it, place a carpenter’s level just above the device and make adjustments until it’s level again. A jarring bump can throw a non-digital thermostat off level and cause setting and temperature discrepancies too. Thermostat Setting and Room Temperature Don’t Matchĭirty thermostat components can cause this issue, so clean the inside as per the above instructions first. If the wiring looks corroded, consider replacing the thermostat. Then look for issues like loose wiring or terminal screws and tighten them up. If it looks dirty inside, use canned air or a soft artist brush to clean away accumulated grime that may be affecting its functionality. If the thermostat is still unresponsive, make sure the breaker is shut off and remove the cover. Try replacing the batteries, then check for a blown fuse or tripped breaker in the electrical panel. If the thermostat’s display is dark, a lack of power may be the issue. Here’s how to investigate three common thermostat problems. Learning some basic thermostat troubleshooting methods may save you the cost of having an HVAC technician make the diagnosis. Thermostat malfunctions can make you think something is seriously wrong with your HVAC system.
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