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-   -   Pilot Won't Light (http://www.diychatroom.com/f17/pilot-wont-light-126930/)

dave54 12-18-2011 09:13 AM

Pilot Won't Light
 
I have an older Carrier furnace that seems to have trouble lighting the pilot. It was a little cold this morning, and I noticed the furnace wasn't running. When I checked it, the starter was sparking, but the pilot wouldn't light. I waited 5 minutes, and it sparked the entire time without ignition. I used a BBQ lighter and the pilot lit immediately, so the gas seems to be okay. Everything else worked fine once the pilot was lit.

The pilot may have ignited at some point, but surely this can't be normal operation, can it? BTW, the pilot is actually a new 3-wire unit that I installed a couple weeks ago because the bi-metal sensor wasn't allowing the main burner to ignite.

Thanks,
Dave

harleyrider 12-18-2011 09:16 AM

Quote:

Originally Posted by dave54 (Post 796603)
I have an older Carrier furnace that seems to have trouble lighting the pilot. It was a little cold this morning, and I noticed the furnace wasn't running. When I checked it, the starter was sparking, but the pilot wouldn't light. I waited 5 minutes, and it sparked the entire time without ignition. I used a BBQ lighter and the pilot lit immediately, so the gas seems to be okay. Everything else worked fine once the pilot was lit.

The pilot may have ignited at some point, but surely this can't be normal operation, can it? BTW, the pilot is actually a new 3-wire unit that I installed a couple weeks ago because the bi-metal sensor wasn't allowing the main burner to ignite.

Thanks,
Dave

The pilot need to be taken apart and cleaned, the orfice is most likely dirty

dave54 12-18-2011 09:30 AM

But it's a brand new pilot with a nice blue flame when lit . . .

Tator1076 12-18-2011 09:55 AM

Quote:

Originally Posted by dave54 (Post 796603)
I have an older Carrier furnace that seems to have trouble lighting the pilot. It was a little cold this morning, and I noticed the furnace wasn't running. When I checked it, the starter was sparking, but the pilot wouldn't light. I waited 5 minutes, and it sparked the entire time without ignition. I used a BBQ lighter and the pilot lit immediately, so the gas seems to be okay. Everything else worked fine once the pilot was lit.

The pilot may have ignited at some point, but surely this can't be normal operation, can it? BTW, the pilot is actually a new 3-wire unit that I installed a couple weeks ago because the bi-metal sensor wasn't allowing the main burner to ignite.

Thanks,
Dave

If it light by grill spark and not it own. You may have the spark rod little off it mark or you may have a weak spark box. If you dont have good enough ground too. It may not lit anyways. The 3 wire pilot need 100% ground for it to work.

dave54 12-18-2011 10:49 AM

Is there some way to test the spark box, like a minimum distance the spark should jump? The spark at the pilot is a nice little blue arc. Another piece of information is that it seems the problem is a bit intermittent, and possibly worst when first lighting after being off overnight when the stat is turned down. I just did an override on the stat and turned it up 1 degree to get the furnace to fire up again, and before I could walk to the garage, the pilot had already lit.

harleyrider 12-18-2011 01:37 PM

Quote:

Originally Posted by dave54 (Post 796619)
But it's a brand new pilot with a nice blue flame when lit . . .

i advise that you not mess with that spark box to much, or you may find out what it feels like to be tased.......you did not mention in the original post that it was a brand new pilot.....clean the spark rod and try moving it ever so slightly.

dave54 12-18-2011 09:41 PM

Thanks Harley, I'll try just moving the rod. BTW, I did mention the new pilot in the original post . . .

Cheers!


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