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Thread: furnace burner???
01-24-2013, 04:21 AM #1
had this one last night. inlet pressure is 6.9 and outlet pressure is 3.45. i cleaned the burners but the only one dirty was the first one that is rolling back at start up. cleaned orifices. still has roll back at start up. i did notice when i was turning the furnace on and off to check it, that if i didnt let the inducer completely stop before turning it back on it wouldnt have roll out. what do yall think?
01-24-2013, 09:37 AM #2Professional Member
- Join Date
- Jun 2012
- rising sun, md
did you inspect the heat exchanger?
01-24-2013, 10:04 AM #3
did you clean the pilot orafice ?
its like the gas valve is opening too slow
can you swap burners around ??
01-24-2013, 10:17 AM #4
check the amp draw on inducer fan motor.Certified parts changer.
01-24-2013, 02:48 PM #5
Amp draw was .9 name plate 1.7
01-24-2013, 03:05 PM #6Regular Guest
- Join Date
- Oct 2011
That is strange, make sure to share the outcome. Never know when youll come across something like this
01-24-2013, 04:42 PM #7
I do remember the valve took about 2 or 3seconds to get to 3.45. Is that normal or is it usually immediate
01-24-2013, 04:54 PM #8
I believe I heard they do make valves that are slow openers , i dont know enough about them to tell you anything , but if one got installed into that furnace on accident , it will act similar to what you are seeing
If the pilot flame is Not big enough it could do that , or make a Whoosh sound
Some are a real pain to diagnose
01-24-2013, 07:32 PM #9
Delayed ignition. Check the runners on the burners. Make sure they are spaced enough. Was the valve replaced?
01-24-2013, 07:34 PM #10
Let the furnace run for 5 minutes. Turn off gas valve, let flame go out, turn it right back on and see if it lights normal
01-24-2013, 09:02 PM #11
01-24-2013, 09:11 PM #12
valve was not replaced. it was original
01-24-2013, 09:15 PM #13
it will light normal because the inducer i still running. it lights normal when i cut the switch off and back on before the inducer has time to completely stop.