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|Furnace: Suburban nt35-k||Troy||1-11-16|
|Furnace will only light when I partially close off intake air from the outside. Will only stay working if I continue this closed off. When I take inside cover off furnace I am getting a lot of cold air coming through and over the top of furnace. Closest air vent I am getting warm air when everything Is closed but furthest vents gets cold air. Flame is blue. New gas valve and sail switch was installed.|
|Re: Furnace: Suburban nt35-k||Bubba The Bus Tech||1-12-16|
|Making a guess: The heat exchanger is cracked or broken. 45% chance. Very dangerous. Remove furnace inspect Heat exchanger inside and out. If the inside is damaged or rotted out it will cause hot spots and eventually carbon monoxide inside the RV.|
Next is a bad burner. Remove furnace, Remove cover and inspct burner. 45% likely
Then comes a whole bunch of stuff including incorrect LPG regulator pressure. Check this first, its quick, easy and cheap to fix.