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johnbear68
Jan 20, 2009, 03:13 PM
I currently have a very basic thermostat connected on my Harman coal stove which has only 2 wires for connection (red,white). I want to connect a programable thermostat, but when I connect the wires to the programable the stove constantly stays on high and wont shut down. The programable is a honeywell model RTH221
Missouri Bound
Jan 20, 2009, 06:26 PM
Is your coal stove a millivolt system?
Missouri Bound
Jan 20, 2009, 06:33 PM
Where did you connect the wires on the Honeywell thermostat?
johnbear68
Jan 20, 2009, 07:24 PM
I'm not sure if it is a millivolt or not, the last thermostat was a basic Honeywell wich worked. I have one red and one white wire, which I attached to the w and RH on the programable. I tried removing the jumper between rh and rc but still had the same results
Missouri Bound
Jan 20, 2009, 07:44 PM
The jumper won't make a difference. Pull the batteries on the stat and start over. Can you program it without connecting it? If so, do that then check the continuity between Rh and W when it's not calling for heat, and when it is calling for heat. If it's not calling for heat and the contacts are closed, the stat is bad. (you'll need an ohm meter)