furnace won’t ignite properly

[Unregistered-wrager]

Comfortmaker Model Number FBF050B12A2

Again the pilot light comes on and then off and then the gas valve goes….everntually they do connect. When you play with it for awhile and get it warm i guess it will connect each time. The longer it sites without being run the longer it takes again to re-ignite….i think it may be air build up or a timing problem. Again they have replaced the gas valve and ignition box and put in a seond ground wire!!!HELP

[Giddaymate]

Hi,
The way you describe what is going on it sounds like it’s 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 doesn’t work you will need to buy a new Thermocouple or Flame Sensor.

regards from Noelene

[Giddaymate]

Hi,
The reason why I think it’s the thermocouple or in your case I think your model has a Flame Sensor is I had a similar problem with my unflued gas heater.

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 won’t allow the gas to come though.
When they start to where 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.

http://www.expertappliance.com/partfinder.php
http://home.howstuffworks.com/how-to-maintain-a-furnace1.htm
http://home.howstuffworks.com/pilot-light.htm

regards Noelene

[Author]

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