We've got an old (25y.o.) GE mod #BLD106F furnace, and it refuses to stay lit. The igniter will ignite the gas, then as soon as the spark goes out, the gas shuts down. Ends up sounding like woof woof woof. We replaced the Pilot Detector to no avail.
To make matters more confusing, it will lite once in a while.
Appreciate any help.
Cold & confused...

Check the pilot orface to make sure it is completely open.

I think that model had a mercury filled auto pilot, if the auto pilot was replaced there was a special risistor kit that had to go with the new one, if the auto pilot mounted on the gas valve. If the auto pilot mounts on the side wall of the furnace that kit was not necessary. My next guess would be a bad gas valve. I would also be sure to do a complete safety inspection, there is a reason I don't see that model anymore, but it was a great! Furnace. I would also blow out the pilot, burners and flame extenders while you are at it. A good service company will do a check and service for about 100 dollars and tell you what is wrong with it while they are there and tell you how much the repair will cost in addition.

I agree with NorthernHeat about the resistor kit. I had a problem with one of these awhile back. The resistors in both configurations are NLA from White Rodgers. Mr. Black VP at WR said that the gas valve was a OEM style that used the resistors (both plug in panel and block style) back in the late 70's early 80's and they were usually on York,Moncrief style furnaces. The OEM valve has not been made since 1980 when the problem was discovered.

Like was said above a good service company with a older tech who would know this is your best bet at this time but do not be surprised if they recommend a new furnace. The one that you have has to be very old and gave meny years of service. On the other hand there could be one of the resistors sitting on a supply shelf waiting to be sold. You never know.

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Originally Posted by hvac1000

Check the pilot orface to make sure it is completely open.

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Thanks a lot! Took the pilot 'y apart and there were two small holes, one of which was partally plugged. Ran chem cleaner through it and them reverse blew it out. Works great now.
Thanks Again~~