Why furnace shut off

Want to skip the hassle of troubleshooting and have a trained tech inspect your furnace? We can help! Now, if you want to learn more about these issues and why they cause the furnace to short cycle, read on. A common reason a furnace short cycles is because the heat exchanger, the part that heats your air, is getting too hot due to a lack of airflow.

Once the heat exchanger overheats, it trips the high limit switch , which shuts the furnace down to protect it. If the heat exchanger gets too hot, the furnace shuts down. With this in mind, you can see why our initial DIY fixes include changing the air filter and opening the supply vents. If the furnace tries to turn on multiple times before stopping for a while, the problem is probably a soot-covered flame sensor rod. Well, the flame sensor rod is a safety device designed to detect a flame in your furnace burners.

If it does not detect a flame, it shuts the gas valve. And one well-lit match could cause an explosion. And no gas means no flame, which means no heat for you. Solution: Clean the flame sensor rod. Give us a call by phone at or book an appointment online to receive assistance. Henderson may use an automatic phone system to contact me. I understand no purchase is necessary and Wm. Henderson may record calls for quality assurance purposes.

No purchase required. To unsubscribe text STOP to Learn More. March 24, By Lyle Wedell Comments are Off We advise customers to have their heating systems repaired as soon as they notice anything wrong with them.

Table of Contents. Yes No. Online Directory Listing Website Other. Emergency Plumbing Services Learn More. Furnace Repair Services Learn More. Drain Cleaning Services Learn More. This is the core of your HVAC system and tells the furnace what to do. Make sure the thermostat is on heating mode and auto fan with the desired temperature showing on the screen.

Try changing the batteries. Also, check whether the thermostat is in direct sunlight or near a heat source that could impact the temperature reading. The flame sensor is responsible for turning off the gas valve when no burner flame going.

An oversized system warms up your residence too fast, creating unpleasant temperature changes and short cycling. The only way to fix this issue is to do new furnace installation. Our priority is to reintroduce indoor comfort, energy efficiency and reliable furnace performance for all season long.

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Dirty Blower Wheel The furnace blower has blades that move air through the ductwork. Faulty Thermostat Inspect your thermostat next. Sooty Flame Sensor The flame sensor is responsible for turning off the gas valve when no burner flame going.