propane furnace does everything but ignite


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Old 02-04-07, 11:10 AM
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Exclamation propane furnace does everything but ignite

I have a propane furnace that does everything but ignite the gas. The induction motor starts, it calls for gas, glow plug glows bright and glows for about say 20 seconds. Then it shuts down for about 20 seconds and then glows again.

Now, I have pulled out the small gas tube and it is clear. I have shined up the flame sensor. I ran the unit with the gas tube removed and gas comes through. I checked the LED for codes but it does not blink. What on earth could it be???

Any help is appreciated.

Thank you,

Mark
 
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Old 02-04-07, 12:36 PM
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Small gas tube?

Check the gas valve. Is it a Honeywell & does the number on it start with SV?
Examples of the number would be SV9500, SV9501, & SV9502. Any of these numbers would be followed by a letter & a 4 digit number.
 
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Old 02-04-07, 01:00 PM
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Yes it is a Honeywell and the number is SV 9501.

I had the small gas tube out of that and ran the furnace and gas did come out of it before.
 
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Old 02-04-07, 01:06 PM
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Smart(?) Valve

That valve is Honeywell's Smart Valve, or as is more commonly known, dumb valve. My only suggestion, other than calling a service person, is to VERY CAREFULLY remove the pilot burner/ignitor & clean the pilot orifice. The reason I say very carefully is the ignitor is extremely fragile.
 
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Old 02-04-07, 01:17 PM
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Wink

Thanks for the reply Grady. I believe you are talking about where the glow plug is? If so, I have looked throught the oriface and it is clear. Are you thinking gas flow is impeded in some way? Could you explain more for the clueless?
 
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Old 02-04-07, 01:39 PM
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Pilot orifice

Next to the ignitor (glow plug) there is a cylindrical area. The small aluminum tube from the gas valve enters the bottom. Take the tube out & up inside the cylinder will be an inverted cup looking thing. It has a very small hole in it. This is the pilot orifice. Try blowing it out with the canned air you use on the computer keyboard.
 
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Old 02-04-07, 01:49 PM
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Thumbs up

O.K. I know that part. I will try blowing it out. Thank you for your help, it is much appreciated.
 
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Old 02-04-07, 01:51 PM
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Be careful

Be careful not to break the ignitor. Like I said before, they are very fragile. Let me know how things go.
 
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Old 02-04-07, 02:07 PM
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Unhappy

Okey dokey, I unscrewed the gas tube and took the oriface out and blew air through it. I reinstalled and ran the furnace, but alas, it still did not work. The ignitor glows bright red for abuout 20 seconds but it does not ignite. I do not understand what the problem is.
 
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Old 02-04-07, 02:13 PM
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Gas

Really makes me wonder if you are getting gas out of the gas valve. Make sure. Sometimes those pilot orifices will become clogged with carbon. Replacement is best left to a pro unless it comes out of the holder easily.
 
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Old 02-04-07, 02:20 PM
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Once when I had the gas tube removed, I ran the furnace and gas did come out of the Honeywell "smart" valve.
 
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Old 02-04-07, 02:44 PM
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Smile

Grady, thank you for your help and have a great day.

Mark
 
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Old 02-04-07, 05:06 PM
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Sorry

Sorry I wasn't able to get your furnace up & running. Once you do, please let me know what the problem was.
 
 

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