Bryant 383KAV Gas Furnace Pilot Light Wont Stay Lit

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Old 12-28-14, 12:36 AM
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Bryant 383KAV Gas Furnace Pilot Light Wont Stay Lit

I have a decades old Bryant furnace that suddenly wont keep the pilot lit. I light up the pilot light but as soon as I release the red push valve the pilot goes out.

I replaced the thermocouple with one that I can confirm is good (it works in an identical furnace in my attic). I've also pulled it out and put it back in about a dozen times now to make sure it is properly seated and installed. The thermocouple sends 27.7 mV when it is lit during my pilot lighting efforts (I tested by removing the other end from the gas valve and tested with my multimeter). I tried to clean out the connection where the thermocouple goes into the gas valve (Honeywell VR8200H 2002) but it already looks clean.

I also removed and cleaned the pilot burner and the flame burns a nice blue (it was kind of yellow at the top of the flame before I cleaned it out). I'm really hoping I missed something so I don't have to have the gas valve replaced.

Any other ideas?
 
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Old 12-28-14, 09:28 AM
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Without a meter attached, my first thought is the "power unit" has failed. The power unit is commonly referred to as the magnet. Which means a new gas valve.
 
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Old 12-28-14, 09:43 AM
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What kind of meter are you referring to? Actually it is a 383KAD model which I believe is a bit older than the KAV.

Is there a way to test the pilot valve by inserting a small magnet where the thermocouple screws in?
 
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Old 12-28-14, 11:59 AM
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Steve,
If you are getting 27.7 mv dc out of the thermocouple & the pilot won't hold, it's time for a new gas valve.
 
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Old 12-28-14, 12:28 PM
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Thanks for the confirmation that I need a new gas valve. Fortunately I can find one shipped for about $90-100. Maybe a local guy can get them same price. Any idea what the labor for installation would be?

And can this gas valve be retrofit with a pilot ignition system?
 
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Old 12-28-14, 01:08 PM
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If you mean a spark to pilot ignition system, I doubt it. It would be unusual if it took over an hour to replace the valve. No idea as to labor rates in your area.
 
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Old 12-28-14, 01:12 PM
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Could I have this Honeywell conversion kit installed instead of the 1/2" x 1/2" Honeywell VR200H1251?
 
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Old 12-28-14, 02:11 PM
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I don't see why not if the gas valve will fit into the space you have. I would, however, check with whomever you plan on getting to do the work.
 
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Old 12-28-14, 02:25 PM
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I will check with my installer but in the meantime my furnace currently uses a 1/2" inlet and 1/2" outlet gas valve. The options for the conversion offer 1/2" and 3/4" outlets. Why the difference?
 
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Old 12-28-14, 03:09 PM
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The 27mv he got was an open read, however he did say he tried another thermocouple. What I meant by using a meter was to install an adapter to test the thermocouple under load. The 1/2 x 3/4 valves come with a bushing to reduce to 1/2
 
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Old 12-28-14, 04:38 PM
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Now I know more about my furnace than I ever did but I'm still a bit confused. Ideally I'd like to buy a replacement gas valve that is as close to the original as possible for ease of installation. I assumed the original is 1/2" x 1/2" because the currently available replacement is 1/2" x 1/2." My current valve has two pipes going in and out with no adapters as far as I can tell. The pipes going in and out have an outside diameter of about 7/8" which is consistent with a 1/2" pipe. Is this correct?

So if I choose to get a gas valve with an intermittent pilot I should get the 1/2" x 1/2" one, right?

Thanks again, Steve

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Old 12-28-14, 05:04 PM
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That is correct. The valve that comes as part of the Y8610U4001 kit is 1/2x1/2. Be sure to check the other dimensions vs those of your old valve. From the photo, it doesn't look like you have much room to play with.
 
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Old 12-30-14, 03:22 PM
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Decided to install the regular gas valve instead of the intermittent pilot version. Obviously not as efficient but simpler to install. Up and running in time for 20 degree days.

Thanks for the help.
 
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Old 12-30-14, 05:52 PM
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As they say, there's two sides to every coin. I'm old school & like a standing pilot especially if the furnace is in a damp environment, that little bit of heat helps to keep the heat exchanger dry all year.
Glad you got it fixed before the cold set in.
 
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