Furnace and or thermostat problem

[Mikesr]

Currenly on a trip and running A/C and not furnace.
The furnace started to make a fan noise and the sound like it's trying to fire the gas.
Moved thermostat to off and back and forth to heat with no change the noise is there yet.
I removed the 15 amp fuse marked furnace and the noise stopped. Problem solved right ? No the thermostat must run off that fuse because then the A/C does not work.
Took access panel off of furnace and can't see any easy fix, that's over my pay grade.
I'm thinking to disconnect a wire to the thermostat that controls the furnace? Which one ?
Furnace is Suburban
Thermostat is Coleman Mach





Thanks for any help

[2oldman]

A google search of that thermo should give you the manual and the wiring. If your internet connection isn't good I can do that for you.

I'm assuming you've not done that already or you wouldn't be asking us. But it seems like every time I say this, the poster comes back and says he did that.