What happens when a thermostat goes bad?

A thermostat controls your home’s indoor temperature.

When it breaks down, you will not be able to regulate your HVAC system, and in turn, fail to keep your home’s indoor environment comfortable.

Often, when a thermostat breaks down, it becomes unresponsive. It fails to detect and adjust to temperature changes as you had anticipated. Sometimes, it may fail to signal your HVAC unit to turn on as expected. In some cases, it would turn the HVAC unit on and won’t turn it off at all. A thermostat could break down because of a wiring defect that disrupts signal transmission between the thermostat and your HVAC equipment. This could cause the system to start and stop unnecessarily. This short-cycling causes temperature variation inside your home. Some rooms will not get conditioned air to heat or cool the room. Short cycling also strains the compressor and raises electricity bills. Check your thermostat’s calibration to ensure it is correct. A faulty thermostat’s screen will be blank and won’t have a backlight even after a battery change. It could also cause the blower fan to run continuously or fail to start at all. Check the wires that run from the thermostat to the central AC and fix them if they are faulty. A thermostat could also have lost its connection to the compressor when the fan is running. Therefore, the HVAC system will not blow cool air from the vents. If you experience any of these issues, you need to call an HVAC technician to fix your thermostat. Better yet, troubleshoot your thermostat and determine the best course of action. Replace the HVAC system’s thermostat if it is completely broken.

Whole home heating