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Having a problem with a gas furnace, it comes on and runs for about five min. shuts off and will not start?
QUESTION:Having a problem with a gas furnace, it comes on and runs for about five min. shuts off and will not start?
again.I checked all the wiring and its ok,if you take the front door off the furnace and push in on the safty switch, the unit will start again but after it shuts off it will not start again. can someone tell me what may be wrong with it. the people are getting cold, they have kids and no money for repairs. the furnace is a carrier and its about 4 years old
ANSWER: The way you describe what is going on it sounds like its the Thermocouple or Flame Sensor, you need to take a look to see which one you have fitted to your furnace.
They both look very similar and they both sense the pilot fame, but work differently. The Thermocouple is made two different metals and when heated it produces D.C. voltage from the energy of the flame. If it starts to break down it can take longer to get heated or stop working all together.
First you can try cleaning the probe, it that doesnt work you will need to buy a new Thermocouple or Flame Sensor.
If the pilot light goes out and the sensor cools down it shuts off the gas supply. Or if they are not close enough to the flame to remain hot they also wont allow the gas to come though.
When they start to wear out you can get the problems you are experiencing. Make sure you don't mistake the sensor probe for the ignition electrobe.
Below are some sites for you to have a look at and one site has the part you may need to fix your furnace.
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