Why is the thermostat in my air conditioner blank?
The thermostat is one of the most important components of your air conditioning system. Without it, you wouldn’t be able to turn your AC on and off or take advantage of the cooling and heating benefits your system offers you. You know your thermostat controls your AC, but what happens when it goes blank?
What happens when the fan is not turned on?
More details are below. If the limit control is not working to turn the fan on when the plenum is warm, the plenum will continue to get hotter; as the burner remains on the plenum temperature will reach the HI LIMIT and a safety circuit in the limit control will turn the burner OFF.
Why does my AC fan keep running when the thermostat is off?
Usually when the relay switch is broken, the fan will continue to run by itself. This happens because there’s no communication between the thermostat and the blower fan. Now, if it’s a short circuit, both the ‘on’ and ‘off’ commands you enter typically won’t get sent to the blower fan.
Why is my AC unit not turning on?
It may be in plain sight or tucked away in a crawl space, closet, or attic. The switch can easily be mistaken as a light switch and someone may have accidentally turned it off. When the switch is in the OFF position, the blower is turned off. This can cause your inside unit to freeze and ultimately shut down your entire AC system.
How does the Furnace Fan limit switch work?
Your furnace fan limit switch is basically a control system that determines when the furnace blower assembly should turn on and off. The system uses a “temperature probe” to detect temperature changes inside the heat exchanger (see image below) and turns your blower on and off in response.
What does it mean when HVAC fan is always on?
ON means that the fan is constantly on and blowing air when your HVAC system is not heating or cooling air. Running your fan on AUTO or ON is a personal preference.
What to do if your thermostat screen goes blank?
If your thermostat screen has gone blank, and your thermostat runs on batteries, the first thing you should try is replacing the batteries with a fresh set. 3. The Safety Switch Was Triggered In some homes, an air conditioner or furnace can trigger a safety switch and turn off the thermostat entirely if any damage has been detected.
It may be in plain sight or tucked away in a crawl space, closet, or attic. The switch can easily be mistaken as a light switch and someone may have accidentally turned it off. When the switch is in the OFF position, the blower is turned off. This can cause your inside unit to freeze and ultimately shut down your entire AC system.