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Suburban furnace nt 40 sylvia 3-30-13  
2 weeks ago we had the motor replaced, new ignitor new wall thermosate it worked for awhile now it acts like there isn't any proane getting to it, it tries but no blue flame and only cold air. can you tell me what could be wrong so we can fix it.

Thank you
Re: suburban furnace nt 40 BUBBA THE BUS TECH 4-1-13  
1st How old is it? Old furnaces can get in the circular repair syndrom. This is where the dang thing needs repair every month or two and its a difrent thing every time. See this a couple time a year. You may want to pric3e out a new furnace.

2nd whenn you changed the "Ignitor" was that the control board or the ignitor probes?

Finally Have you had the board tested? Have you tested the gas valve, Tested the limit and sail switches? Have you inspected the burner head?

All these items will cause your symptoms.

Good LUck
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