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can you tell if the the furnace has power? any hum, any lights?
Tape thatt switch down or put door back on...Is this unit in attic, or does it drain to a pump or floor drain?
In the furnace..
what is the make/model
Is alight blinking or solid?
Some faults can cut power to thermostat
we can narrow down quickly now...At thermostat...remove top section...locate wire on R and wire on W...connect them together wirh a u shaped wire, paperclip etc..or remove and twist together...tell me if furnace starts
do you see the thermostat wires and where they attach?
what terminals do you see and what color thermostat wire is attached
what terminal is red and white on?
there is no W?
usually yellow = y
white = w
red = r
Strange...has thermostat been replaced?
Take the red wire and green wire and connect and tell me if furnace blower kicks on
the furnace shows power...but no power is getting to thermostat.
Have you checked the wire from the time it leaves R in the furnace to the thermostat?
you can...you can use paperclip icon or "attach files" button
no I did not.
I will opt over to someone who will be online longer to assist you..
IF you still need help tonight I can assist