Pilot goes out, burner not lighting
Posted: Wed Sep 15, 2010 9:46 am
Nordyne model M1GH 070A BW: Furnace has been in use (LP gas) several years with no problems. This summer I turned the pilot off because of hot weather. Now having trouble getting it to stay lit - I light it according to directions, set control to on and it goes out after about a minute; turning up thermostat while pilot is still lit (before it goes out) and neither light (burner seems to blow out pilot). Pilot adjustment makes little difference in pilot flame.
First tried taking burner assembly out of furnace - pilot will stay lit with assembly out but when I replace assembly into furnace with pilot still lit, it weakens and goes out after about a minute. Replaced thermocouple with new and still have the problem.
Next, got up on roof and found that several inches of soot had accumulated in bottom of flue blocking it so I vacuumed it all out hoping that would fix the problem. No such luck - still have the problem. Suggestions?
BTW the gas orifice has the red band marked LPG installed closest to the valve body and is on the left side of the valve body - I'm wondering if it should be on the up side? Is valve installed wrong or doesn't that matter?
First tried taking burner assembly out of furnace - pilot will stay lit with assembly out but when I replace assembly into furnace with pilot still lit, it weakens and goes out after about a minute. Replaced thermocouple with new and still have the problem.
Next, got up on roof and found that several inches of soot had accumulated in bottom of flue blocking it so I vacuumed it all out hoping that would fix the problem. No such luck - still have the problem. Suggestions?
BTW the gas orifice has the red band marked LPG installed closest to the valve body and is on the left side of the valve body - I'm wondering if it should be on the up side? Is valve installed wrong or doesn't that matter?