There are several safety sensors in the furnace that along with low voltage could be causing the furnace to shut down. It's almost impossible to self diagnos this problem. One other problem I've had is low gas pressure. The way to check this is to light a burner and watch how it burns as the furnace goes on and off.
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Dave & Barbara
KenWorth T2000
2005 Mobile Suites 38RL3 #2338
MorRyde IS 8K axles, LazyBoy recliners, LCD tv
Full time since '96
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