Quick way to eliminate the thermostat is to remove it from the wall and tie the two wires from the furnace together. These are normally the white and black wire.
If the furnace begins to operate (fan runs) then the thermostat is defective.
2013 Rockwood 8289WS
Mods: Central Vac, PI EMS-HW50C, 2025RV, (2) SCS225 Trojans, PD9260, Awning Remotes & LED Lights, Eliminators, External Water Filter,, Intellijacks
2008 RAM 3500 Cab&Chassis Hauler Bed, B&W Companion Hitch
All My Modifications are at this link: