Installed Honeywell thermostat, furnace inop
I replaced a mechanical Coleman Mach thermostat with a Honeywell non-programmable thermostat. I tested out the A/C a few weeks ago and it works fine, even with the toggle switch I added for the fan h...
Forum Discussion
If you have 12 volts (nominal, of course) at RH, then W should have 12 volts when calling for heat. Make sure W is connected to the "cold" thermostat lead from the furnace. Try setting heat to electric, rather than gas. (or vice versa).
