Furnace Turns Off After One Cycle-Aerolite 195QB

[RetiredRN]

Our Suburban furnace with a Dometic LCD thermostat will turn on, run once or sometimes more then turn off. The only way to get it to run again is to shut it down and re-start. My daughter's Aerolite 215BHKS does the same thing. Any ideas?

[BigBoyjack b]

Sounds like your fan speed is set at "Auto" which will cause it to cycle on and off as it reaches the designated temperature. If you punch the on/off button 3 times, it should read "Auto/Lo/Hi" in sequence. If you leave it on "Lo or Hi", the fan will continue to run and actually uses the A/C for demisting or humidity control. If you set it on "Auto", then the fan will run until it reaches whatever temperature you set and should then come back on after the temp as dropped a couple of degrees. Just a thought.