Thoughts on intermitten issue?


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Old 01-08-15, 07:24 AM
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Thoughts on intermitten issue?

My Inner City 5100BFC1 propane central furnace has been working okay this season. I increased the temp on the stat the other day and the furnace failed to ignite, I could hear the stat calling for heat but it never would light. I turned it back down and after about 30 minutes I tried it again and it worked as it should. I don't think there were any out of norm environmental issues; temps and wind were not extreme. What would make it not light, is there a component that I could look at? The tech could not find anything wrong when he checked it last year, I told him that it was taking longer to fire up and this year it is working much better and no the tech did not alter anything.
 
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Old 01-08-15, 07:52 AM
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So on a call for from the stat the burner doesn't fire up,have you checked to be sure you have a strong pilot flame,at that it is impinging on the thermal couple rod,you may try the Tap Test,which would be to tap the gas valve with a screwdriver handle during a call for heat and see if the valve may be sticking,have someone turn the stat up while you are at the burner,also note if the pilot may be being pulled away from the thermal couple by a draft.thermal couples do fail as I have replaced 3 in 4 years.
Geo
 
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Old 01-08-15, 07:52 AM
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Do you have a volt meter? Try to follow the current from the control board to the other components.
 
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Old 01-08-15, 09:52 AM
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There is no standing pilot, it is a glow plug if I have my terminology correct. I see it glowing so I am leaning toward the gas valve or the thermocouple. May have a tech come out and have him check the whole system. The intermittent part is what is throwing me, you would think that if a component is going bad it would have crapped out by now.
 
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Old 01-08-15, 10:56 AM
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This appears to be the same problem(s) you were having last year. Did you look into the propane pressure/vaporization issue ?

http://www.doityourself.com/forum/ga...t-problem.html
 
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Old 01-08-15, 01:21 PM
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Same or at least similar issue as last year. I had the propane guys check things out along with the HVAC tech and nothing sticks out as bad. Very frustrating but it is functioning so I guess I will just wait until it gets worse. We mostly depend on the pellet stove for heat so it is not critical.
 
 

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