my furnace turns on, then immediately turns off

Old 12-19-09, 07:29 AM
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my furnace turns on, then immediately turns off

good morning! Brrr! It's cold in my house! and it's because my furnace doesn't stay on. I have a 4 year old Frigidaire Nordyne furnace, model c38a (I think that's the model #). Here's what happens:
The furnace turns on for a few seconds, then turns off!
the pilot light lights with a fan, and a short while later the whole furnace flame lights, but then a few seconds later... I hear a click and the furnace turns off! I thought maybe my flame sensor needs cleaning. Please understand, I've only read of this possible cause of the problem online this morning. I really don't know what I'm talking about! But I'd love to be led thru to the solution and fix it myself! Thanks. Rick
Old 12-19-09, 07:38 AM
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The first thing to do is jump the thermostat to eliminate that as the problem. After that, I would look at the control board.
Old 12-19-09, 09:15 AM
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Did you clean the flame sensor? I don't think that is your model number. Is the a condensate furnace?

This is from an 80% Nordyne manual...

Furnace Fails to Operate
If the furnace does not operate check the
1. Is the thermostat operating properly?
2. Are the blower compartment door(s) in place?
3. Is the furnace disconnect closed?
4. Has the circuit breaker tripped or the control
board fuse burned open?
5. Is the gas turned on?
6. Are any manual reset switches open?
7. Is the filter dirty or plugged?
8. Is the flame sensor coated? (Remove and
clean with emery cloth.)
If the furnace locks out after 5 attempts for
ignition, it will try again every hour if a call for heat
remains. If the inducer and circulating air blowers
are operating, and items 1 through 8 have
been checked, press the red reset button on the
vent safety switch (See Figure 29). If the furnace
operates after depressing the reset button,
contact a qualified serviceman to identify
and repair the problem.
If the furnace continues to not operate, depress
the red reset buttons on the flame roll-out
switches. (See Figure 29.) If the furnace operates
after depressing the reset buttons, contact
a qualified servicemen to identify and repair the

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