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Old 12-26-2009, 08:59 AM   #1
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Gas furnace briefly shutting down


Hi,

I have an induced gas furnace w/electronic spark ignition that's about 15yrs old. I'm in Texas. The furnace will run fine for quite a while trying to reach temp but before it gets there it will shut down. It doesn't shut down completely though. The draft inducer motor continues to run and it will restart within a minute (the pilot goes out and relights). Always restarts on the first attempt.

When its very cold and running for a long time it will do this several times before reaching the desired temp. When it doesn't need to run very long to get to temp it doesn't happen at all. I tried the following:


New T-stat
New filter
Clean furnace/burner area



Any idea what this might be?
Thanks.

John

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Old 12-26-2009, 10:01 AM   #2
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Gas furnace briefly shutting down


Flame sensor

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Old 12-26-2009, 10:54 AM   #3
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Gas furnace briefly shutting down


Quote:
Originally Posted by Tator1076 View Post
Flame sensor
That's what I thought after doing some searching but it seems like the flame sensor issue occurs when the pilot will light for a few seconds. Mine will stay on for long periods of time, go out briefly then come back on. The pilot doesn't go out right after it lights.
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Old 12-26-2009, 10:54 AM   #4
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Gas furnace briefly shutting down


Your furnace is probably overheating and opening the high limit switch. This is normally caused by a lack of airflow through the furnace. A restrictive or dirty filter, dirty evaporator coil, over fired burners or inadequate ductwork are usually responsible for high limits opening.
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Old 12-26-2009, 06:35 PM   #5
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Gas furnace briefly shutting down


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Originally Posted by SKIP4661 View Post
Your furnace is probably overheating and opening the high limit switch. This is normally caused by a lack of airflow through the furnace. A restrictive or dirty filter, dirty evaporator coil, over fired burners or inadequate ductwork are usually responsible for high limits opening.
Thanks for the reply. I'll try your cleaning suggestions. I also hear kind of a clang of pipes about one minute before it shuts down. Could that be significant?
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