Where to find and how to replace pilot parts

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Old 01-01-09, 10:20 AM
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Where to find and how to replace pilot parts

I have a Williams Furnace model 625DVX-RLPG, which is a Propane unit attached to the wall.

The pilot light now goes out after every 2 or 3 cycles. I can relight the pilot quickly, and it stays lit for those 2-3-cycles, then goes out.

All I know about pilot lights is that there is something called a thermo coupler that (I think) provides the spark to light the pilot. This seems to be working properly, so I assume there is something in the actual pilot light mechanism to replace?

I have no idea where to get replacement parts for this furnace - it is about 20 years old.

Can anyone tell me how to locate the part(s) needed and any tips on actually replacing those parts?

Thanks!
 
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Old 01-01-09, 11:17 AM
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Odds are that the pilot burner is dirty and needs to be cleaned to restore proper operation. If you look at the pilot flame, you will probably see a sort of lazy blue and white flame that is fairly easily blown around --- and out.

The pilot flame should be pure blue and sharp, like a small blowtorch.

If that's the case, the pilot burner need to be removed, diassembled and cleaned, including a small fitting going over the pilot tubing called the pilot orifice.

The pilot orifice has a very small hole in it which forms the jet of gas for the pilot burner, and the best way to clean it is with a wire from a wire brush.
 
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Old 01-01-09, 12:56 PM
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Thanks

Thanks - I'll give that a try.

So you think it is a cleaning task rather than a replacement task?

I ask because it is a 2 hour drive to our cabin, where the furnace is.

Would it be worth my while to buy a replacement pilot light assembly (if there is such a thing) to be safe?

Thanks again.
 
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Old 01-01-09, 02:16 PM
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Finding the right pilot assembly would probably be a job.

If the thermocouple were the problem, the furnace pilot would probably not stay lit at all.

So more than likely, the pilot burner and pilot orifice need to be clean and that will solve the problem.
 
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Old 01-02-09, 12:59 PM
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That makes sense

That makes sense - I'll try to clean it as you suggest.

Thanks for the help!
 
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Old 01-02-09, 05:44 PM
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Does your furnace have a wall thermostat or a "bulb" thermostat (one that is on the gas valve)? If bulb type you have a thermocouple, if wall type you have a pilot generator. Probably the 250mvrather than the 750mv. Williams used a lot of smaller low input pilot generators and when they got the least bit dirty would fail to work properly.
One more thing: is this a conventional wall furnace on an inside wall or a direct vent on an outside wall?
 
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Old 01-03-09, 08:25 PM
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wall thermostat and outside wall w/ direct vent

It has a wall thermostat and is on an outside wall with a direct vent.

It has been in our cabin for 20 years, never had a problem until now.

So it sounds like I have a pilot generator, either 250mv or 750mv?

Can I buy a replacement pilot generator? Can I 'upgrade' to an 750mv if it turns out I have a 250mv?

More to think about -- thanks.
 
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Old 01-04-09, 04:48 PM
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Yes you can use a PG-9 if room permits..First make sure this one is burning clean and impinging on the generator cartridge.
A PG-9 "should" be available from a full service hardware store or online. Be sure to shop online prices before you purchase.
 
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Old 01-05-09, 09:00 AM
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Thanks,

Thanks - will do.

jej1216
 
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