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QUESTION:I recently moved into the house we're living in, and have been having
problems with the gas furnace. I am an electronics technician, but have
not messed with furnaces.
My furnace appears to be made by Carrier. Model 395CAV036055, Serial #
3590A11001, Input 66,000 BUT/hr.
Here's my problem.....The electric ignitor (not sure if that's what it
is called) receives power (and glows, of course), then the gas is turned
on and it lights, then the electric ignitor begins to cool down and the
gas shuts off. Then the whole cycle repeats itself.
I have found that if I shut the gas and electricity off and clean
everything out, it will work fine for about a month, and then it will
start doing it again. Lately, that hasn't been working though, it only
works for a couple days. There are 3 gas burners on my furnace, and I
noticed that one of them has a temperature (or maybe flame?) sensor
that pokes up into the flame. It has one wire going to it. Is there a
way I can test this (I have a good multimeter)?
ANSWER: Clean the flame sensor. It gets a build up on it and wont sense the
flame. You may want to replace it. Make sure all of your grounds on the
flame safeguard circuit are clean also.
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