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Suburban nt40 furnace bill gwynn 10-9-09  
We turn our furnace on and everything seems to work, then flame goes out but fan does not.......keeps blowing cold.....turn thermostat off and back on again.....works for a while then flame goes off but fan does not......keeps blowing cold.....replaced limit switch on fire box but problem persists.....help please.....why does it work the 1st time and then not come up to temperature.....
Re: suburban nt40 furnace Dennis 10-11-09  
Hi. Here's a link to a Suburban furnace troubleshooting guide. Maybe you can find something here:

http://www.ducktec.com/furnace-trouble-shooting.html
Re: suburban nt40 furnace Ken Ehresman 2-3-10  
Yep. Me too.. My NT 40 sometimes works for a while then not... changed the spark ignitor/thermo coupler thinking that was the problem but no such luck... anyone have any ideas?
Re: suburban nt40 furnace Keith 10-12-09  
Hi Bill, Please let me know what happens. Thanks.
Re: suburban nt40 furnace Keith 11-25-09  
Hi Bill, Congrats on getting your furnace going!
Re: suburban nt40 furnace Jason 12-3-09  
I have the exact same problem. What ended up being the solution?
Re: suburban nt40 furnace ray 12-5-09  
Just wondering what the cure for that nt 40 furnace was that bill gwynn had as i have the same problem ????? was it the board ??? as ive also changed my limit switch but to no avail what is the cure ? please let me know
thanks in advance

ray d.
Re: suburban nt40 furnace char brazell 2-6-10  
Yea me too ours does the same thing,replace high limit switch twice. works for awhile then not. whats the problem? would like to know if bill got his fixed.
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