Cumberland Uplow no heat

[Bronson]

UPFLOW LOL.Howdy. I installed a Cumberland 80,000 btu uplow furnace in My home in 95. In 96, after issues, I installed the 3793 upgrade kit, and performed the safety checks. "This kit is designed to convert any known Radianr sense ignition system furnace to a flame sense ignition system. A flame sense IFC is included in this kit" This was supplied no charge to Me by Cumberland. I used to be a Service Tech for Carrier, in Residential H/C, so I felt comfortable doing the install and the upgrade.
No issues from 96 until last winter. Several times, the unit went on lock out, code shows "Lockout, check line polarity". I rewired the entire house in 94, including weatherhead and panel. Inspected and passed , no other home electrical issues.
The unit didnt give any further issues, EXCEPT: I heard a late ignition, on one burner, when it ignited. No flame roll out shutdown was induced.. I pulled the entire burner rack, inspeced and cleaned and observed no issues, defects. I reinstalled the rack and fired it up, operated normally. This was last winter.
This morning, I realized the blower was still running, with no burner. It was flashing normal call for heat. I unplugged it and tried again, flashing normal call for heat. I unplugged and re-plugged flame sensor, high limit and all the accesible plugs. The unit fired and ran normally, EXCEPT, no ignite on the same burner as last year. It is of course, as Holiday weekend, and tomorrow it is suposed to get COLD. I am without parts until Monday, if I need any. Any ideas on the polarity/ no-slow ignite one burner issue? Thanks! Don

 

[Bronson]

bump-it's gonna be cold tomorrow....

 

[rickairmedic]

Don take the burners out to the garage and blow them out with compressed air and put them back in . I have seen this alot more in recent years with exhaust fan equipped furnaces . All it takes is a little dust in there and you will get this . I use my nitrogen tanks on the truck for this but compressed air from the compressor will do it as well.

Rick

 

[Bronson]

Rick, thanks for the quick reply. Last year, when it first did this, I pulled the burner rack out, took it to the shop and blew it out. i visually inspected all four burner spuds, and checked to see if their was loose debris inside the manifold. It was all clean, if a little dusty. I even stuck the shank of a drill bit thru each spud to make sure it was clear. If I block one spud with My finger while in burner , the guilty burner will fire right up, and will keep burning when I take My finger off the other jet. It does light most of the time. It's the times it doesnt light, and that gas is building up, that worries me.

 

[Bronson]

BTW, Rick, dont know if it matters, the non-lighter is the one closest to the igniter......

 

[rickairmedic]

While you have the burners pulled go ahead and pull the orfices and make sure they are clean . Spiders will get up in there and clogg them up over the summer .


Rick

 

[Bronson]

Thanks, Rick!

 

[rickairmedic]

No problem did that get her running right again .


Rick