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Old 07-26-2011, 01:00 PM   #1
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Gas Valve


I am having a hard time diagnosing a warm air furnace. Its gas hot air out vented. The heat call was no heat I changed the hot surface igniter which needed changing. she glowed and I heard gas coming into the gas ports of the burner but no ignition. Crazy.
I have gas coming in and the glow of the igniter but no flame/heat. It is weird that I don't smell gas though real weird but you can hear the sound of gas coming into the ports/orifices. Any help on this one?
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Old 07-28-2011, 06:47 AM   #2
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Please do not post questions in our How To section.
Moved to HVAC where someone might actually see it and help you.

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Old 07-28-2011, 04:48 PM   #3
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Purge the gas line for 3-4 seconds and you should smell the gas then.Hook up a manometer and check incoming and manifold pressure. If it still doesn't light then the HSI needs repositioned.
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Old 07-28-2011, 04:53 PM   #4
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HSI?

WHat is HSI?
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Old 07-28-2011, 04:54 PM   #5
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post brand name and model #. HSI=hot surface igniter
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Old 07-28-2011, 04:57 PM   #6
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I was wondering that myself....
Hey Marty, please remember this is a DIY site and most of the people asking questions do not understand abbreviations and terms you may be familiar with and use on a daily basis. No offense intended of course. I've asked numerous times what initials meant.

Thanks

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Old 07-28-2011, 04:59 PM   #7
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Quote:
Originally Posted by DangerMouse View Post
I was wondering that myself....
Hey Marty, please remember this is a DIY site and most of the people asking questions do not understand abbreviations and terms you may be familiar with and use on a daily basis. No offense intended of course. I've asked numerous times what initials meant.

Thanks

DM

What DM means??????
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Old 07-28-2011, 05:01 PM   #8
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My wife thinks it stands for "DAMMIT MICKEY!!!"

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Old 07-28-2011, 05:02 PM   #9
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Thanks for that. No I didn't know the abrev either and I been in the trade a long time. The HSI has be replaced however I noticed the new one had a SS protector around it with holes for the heat/glow to ignite the gas. I am wonder now if the protector is the problem that the original HSI didn't have?

This HSI is slim not like the usual ones we use. Bil
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Old 07-28-2011, 05:06 PM   #10
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DM, if you are a mod you may want to combine his lower post with this one?

Post the brand and model and I/we may know its quirks. HSI type and positioning is VERY specific and critical on some units especially the Carrier high effs. over 3 yrs old. Gas may be skipping over the igniter. Burners may be dirty and need cleaning. Remove them and blow them with compressed air and then flush them with hot water in a sink and dry them.
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Old 07-28-2011, 05:14 PM   #11
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Yuri

The model furnace is not very viewable. Think it s a Goodman GMPN080-4 Furnace. There is a call for gas sounds ignitor not glows but not flame ignition.
The HSI is placed where it is supposed to be but as I look at it you may be right about the position. That is a delicate part not sure how I can reposition it.

Thoughts...Bill
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Old 07-28-2011, 05:19 PM   #12
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Quote:
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DM, if you are a mod you may want to combine his lower post with this one?
Combine his post with yours???? You're kidding, right?
I'm confused enough already!

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Old 07-28-2011, 05:19 PM   #13
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I ALWAYS like to use OEM/factory parts for that reason. Some units are even color sensitive with the igniter. If it does not heat up fast enough/glow bright enough it won't hit the proper ignition temp. As they die the resistance gets higher and it takes longer to glow and does not get red enough fast enough. Get the Goodman HSI and clean the burners. You can also get a wicked delayed ignition if the HSI is not in the proper position etc.
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Last edited by yuri; 07-28-2011 at 05:23 PM.
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Old 07-28-2011, 05:21 PM   #14
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http://www.diychatroom.com/f17/gas-valve-112238/. Not sure how it got posted further down on this page.
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Old 07-28-2011, 05:22 PM   #15
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Ohgoodgrief... I see what you mean now.
Bill, please don't duplicate post here. It's hard to decide which one to delete.

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