Central furnace cuts off just after starting

[Jon]

Ruud Silhouette II, automatic pilot Started it up for the first time this season- pilot glows, gas blows in and starts burning for a few seconds then flames and pilot die. Blowing cold air.

[Jon]

Forgot to mention only the chamber on the side with the pilot starts burning, no flames at all on the other side.

[Robert Neville]

Sounds like a bad thermocouple. Safety circuit will close the gas valve if the burner doesn't warm up quick enough.

[Stormin Mormon]

Probably a safety device doing its job. Please tell us what the repaair tech finds.

[hrhofmann]

Did you expect it to blow hot air after only a few seconds??

[Jon]

What repair tech? After doing some research online I blew it all out with an air hose and it is now working fine. Something was clogged up with dust or whatever.

[Jon]

Yes. It always did before.

[The Daring Dufas]

You just experienced the KISS principle of repair. I went on four service calls today and one was "no trouble found" and two were "wire unplugged" and the other was a "spring out of place". All very simple repairs that required me to drive all over the darned county. I spent more time on hold with dispatch than I did repairing things. I never ceased to be amazed at the simple things I find wrong. I do have a head scratcher every now and then, things like hairline cracks, pinhole leaks and I've not only found bugs in equipment but I found an electrocuted mouse across the power terminals of a compressor. I love my work.

*snicker*

TDD

[Stormin Mormon]

Stand by for repeat occurance. Since you're not sure what was wrong, or what you changed.

[Tony Sivori]

I had the same symptom with the same brand and model name. Mine has the electric igniter surface, not a pilot light.

The problem with mine was the flame sensor. A very light sanding and it has been working well for the past two years.