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My Gas Fireplace Shuts Off After A Few Minutes. Why?

Customer Question
Why does my gas fireplace...

Why does my gas fireplace go out after only a few minutes of running? I have replaced the valve, the thermopile and over temp sensor. It starts up fine, runs for about 5-10 minutes than completely shuts off...pilot and all.

Submitted: 7 years ago.Category: Home Improvement
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Answered in 2 minutes by:
2/9/2010
Home Improvement Expert: Rick, General Contractor replied 7 years ago
Rick
Rick, General Contractor
Category: Home Improvement
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Hi,
You may have an over temp device that is shutting it down. These devices are installed to shut down a unit if it gets too hot. It's possible that (if this is the problem) the device may be faulty and is shutting it down when there is no hazard.

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Customer reply replied 7 years ago

I have replaced the over temp sensor. Also, when the flame goes out, I am able to place my hand on the area where it's located and since I can touch it without getting burned, it's not too hot.

Home Improvement Expert: Rick, General Contractor replied 7 years ago

What controls the fireplace?

Is it just on or off?

Does it have a remote?

If the unit has any control device try jumping it out at the gas valve and see if the problem persists.

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Customer reply replied 7 years ago

It has a simple on/off switch. I am unable to turn it on again until I re-light the pilot light.

Home Improvement Expert: Rick, General Contractor replied 7 years ago

Try relighting the pilot and jump out the switch at the gas valve and see what happens.
Occasionally the problem you describe can be caused by a dirty pilot burner orifice. This could cause the pilot to go out and subsequently shut down everything.

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Customer reply replied 7 years ago

That sounds like a reasonable root cause. I wonder why the pilot light can be lit and run OK but that when the flames are on, a dirty orifice would prove more of a problem when the flame is on than when it's off?

Home Improvement Expert: Rick, General Contractor replied 7 years ago

If there is a piece of dirt or dust floating around in the line it can cause a real headache. One other possibility is if a stray flame from the main burner is hitting the thermopile. This has happened to me a couple times and it drove me nuts.
The thermopile must maintain a cold junction below the top 1/4 of the tip that is in the pilot flame. If the lower 3/4's to 2/3's gets hot it will shut everything down. This cause, although rare, is a possible culprit.

Rick
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Customer reply replied 7 years ago

OK...thanks...that should provide me enough information to troubleshoot the problem. I didn't know the thermopile needed to have that temperature difference.

Home Improvement Expert: Rick, General Contractor replied 7 years ago
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