Smart Valve Problem?

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Old 01-05-09, 08:25 PM
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Smart Valve Problem?

I have a Heil Propane furnace that wont start by itself. I have replaced the ignitor but no difference. Furnace starts...ignitor gets hot.. but pilot light doesnt light. If I put a match near the pilot while ignitor is hot.. pilot lights... and burner starts normally. I just cant get the pilot to light on its own.. Thanks for any help.
 
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Old 01-05-09, 08:59 PM
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The pilot orfice might need to be cleaned. Sometimes you can remove the pilot tube from the valve and blow it out. Sometimes you have to take it out to clean it.
 
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Old 01-06-09, 04:00 AM
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What is the best way to clean it? I can blow through the tube (without much difficulty) and hear air coming out of the orfice.
 
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Old 01-06-09, 08:52 AM
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Obviously test the ignitor also.
 
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Old 01-06-09, 09:13 AM
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If you have a Hot Surface Ignitor that glows to light the gas, you don'y have a pilot to clean.

Since the gas will light with a match, that implies that the HSI isn't getting hot enough to light the gas, which can happen. I'd measure the voltage supplied to the HSI with an AC voltmeter to make sure it's at or around 120 VAC. If it is, I'd replace the HSI.
 
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Old 01-06-09, 09:28 AM
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Actually the smartvalve system uses a 24 volt hsi to ignite the pilot.
 
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Old 01-06-09, 07:07 PM
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Thanks for all the help. Problem is resolved. I removed pilot orfice and cleaned it with blow gun, Disconnected all wires and plugs and checked for corrosion, and checked voltage at ignitor(22.7 volts). When I was done...pilot lit and all is well. Thanks again for all the help.
 
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Old 01-06-09, 07:47 PM
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Good job, perfect outcome
 
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