What could couse a lp gas furnace to move about on and stale to much?

right now it's runs for in the order of 1-2 minutes then shut stale and the it will start back up within about 2-3 minutes. The flame is ok it purely keeps stopping and going. When it shuts of sometimes it sounds similar to it's creating a back draft. Please does anyone know why it's doing this. I checked the Thermacouple and it seem to be ok. HELP Thanks


Answers:    Check your thermostat. It may need to be replaced or it could simply be stale level. If it's not stratum, the mercury switch attached to the coil will not work correctly. You can level it near a small torpedo level and a screw driver. It's easier to try the simple stuff first. Also check your procession from the tank to the house, it might enjoy a slight kink in it. If that's the valise call the repair man to replace it.
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