Dead furnace and thermostat feed
Late last year, I swapped out a mechanical Coleman Mach thermostat for a Honeywell digital. The A/C worked fine on the Honeywell but the furnace would not kick on and I ignored the issue believing it...
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Coleman Mach/Atwood to Honeywell wiring should have been connected like this:
Red wire to “Rh” terminal (Rh and Rc utilize a jumper) (12V DC power)
White wire to “W” terminal (12V To furnace from t-stat)
Yellow wire to “Y” terminal (12V to A/C relays)
Green wire to “G” terminal (A/C High Fan)
Gray (not connected) (A/C Low Fan) Unless a hi/lo switch is installed
Blue (not connected) (12V Neg)
HG/HE on backside of t-stat set to HG
What Atwood Model do you have?Atwood Furnace Manual
Red wire to “Rh” terminal (Rh and Rc utilize a jumper) (12V DC power)
White wire to “W” terminal (12V To furnace from t-stat)
Yellow wire to “Y” terminal (12V to A/C relays)
Green wire to “G” terminal (A/C High Fan)
Gray (not connected) (A/C Low Fan) Unless a hi/lo switch is installed
Blue (not connected) (12V Neg)
HG/HE on backside of t-stat set to HG
What Atwood Model do you have?Atwood Furnace Manual
