Heater turn off by itself

  • The flame sensor monitors the burner to detect whether or not a flame is present. If the flame sensor is defective, it might fail to detect a flame. If the flame sensor does not detect a flame, the control board will shut off voltage to the gas valve to prevent the furnace from heating. Sometimes, if the flame sensor is dirty, it will fail to detect a flame. Try cleaning the flame sensor with a fine abrasive pad. If the furnace still doesn’t heat, replace the flame sensor.
  • The control board regulates the power supply to all of the components of the furnace. If the control board is defective, it might not send voltage to the ignition system, causing the furnace to shut off after a few minutes.
  • The pressure switch closes when the burner has sufficient airflow. If the pressure switch isn’t working, it might not close when the proper airflow is present, causing the ignition process to stall. If the ignition process stalls, the furnace will shut off. To determine if the pressure switch is defective, use a multimeter to test the switch for continuity. If the pressure switch does not have continuity, replace it.
  • The draft inducer motor draws air into the heat exchanger and then exhausts it out the flue. The pressure switch senses a pressure change and closes a switch to signal the control board that the furnace has proper air flow. If the draft inducer motor is defective, it may be unable to close the pressure switch, causing the ignition process to stall and the furnace to shut off after a few minutes. If the ignition process stalls, the furnace will shut off. If the draft inducer motor is at fault, replace it.
  • The flame rollout switch monitors the heat surrounding the burners. If the inducer fan motor cannot draw enough air through the burners, or if the furnace is not venting properly, the rollout switch will open to halt the ignition sequence and prevent the furnace from heating. When this happens, the furnace will shut off after running for a few minutes. To determine if the flame rollout switch is defective, use a multimeter to test it for continuity. If the switch does not have continuity, replace it. Be aware that poor airflow through the burner is often a result of insufficient ventilation or a restricted exhaust vent. Make sure that your furnace is in a properly ventilated location and the exhaust vent is clear of obstructions.
  • The furnace must have proper airflow through the burner in order to continue running. The furnace draws air from the surrounding area or from outside the room. If the furnace is located in a utility closet or in a cramped storage room, there may not be sufficient available air for the furnace to heat properly. If the furnace draws air from outside the home, check for an obstructions at the air inlet.

Fuse HVAC, Refrigeration, Electrical & Plumbing will restore your Heater.

HVAC Repair in San Jose, California

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Yelp reviews for San Jose, CA
Andrew W.
2024-01-10 01:17:38
I wanted to leave a review saying that I had a great experience with Fuse to replace an old HVAC system in my Condo which had a rare setup, being a ducted...
Andrew H.
2023-12-03 11:13:49
The scale of our plumbing project was frankly crazy - I don't think we'd have started if we knew what was in store for us... but I am so glad we did. Fuse...
E. C.
2023-11-06 16:18:00
I asked Fuse to install a Tesla Wall Charger for my home in the Peninsula. Reasonably priced, especially compared to other non-local companies out to charge...
Ram K.
2023-11-04 15:55:17
Quote response was prompt. Adrian came on time and spent 2 hours to diagnose a miswired circuit that had blown a fuse (the fuse block was actually blown,...
Jose A.
2023-10-25 10:58:08
Bolt and his teammate did an excellent job in the installation of a Daikin heat pump. They were very professional, neat, and efficient. I would highly...
Brad K.
2023-10-14 17:21:16
Summary: - Great work quality with if and complicated project - Fair pricing - Great rebate submission process We wanted to replace our old furnace...
Eddy W.
2023-08-26 18:13:31
I needed a heat pump HVAC system for my new home. Fuse came to our site prompt after we seek their help on yelp. I love digging into all the tech aspects...
Mandy F.
2023-08-07 22:10:51
We had a really great experience with Jeff, our estimator, and the technicians Oleg and George with our mini split A/C unit in our upstairs home office/...
Jeff C.
2023-07-19 10:12:37
We had an issue with our A/C system suddenly not turning on, and FUSE was able to come out within 24 hours and diagnose/ repair the problem. We have used...
Robert L.
2023-06-22 22:06:00
We just had Fuse install a heat pump to replace our gas furnace. The guys who did the installation, Angel and Alex, were professional and courteous and did...

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3314 Victor Ct, Santa Clara, CA 95054

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