Honeywell thermostat install


Old 09-30-20, 12:59 PM
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Question Honeywell thermostat install

honeywell rth6580wf thermostat install, furnace only has heat and runs only 2 wires, i need help with install and how to wire new thermostat. i can upload pics if needed thanks for any and all input. the pic is of old thermo wires. the furnace has 2 wires as well a red wire attached to the "R" and a white wire attached to the "W1" any suggestions or will i need all new wiring?


Last edited by Todd Harrington; 09-30-20 at 01:05 PM. Reason: adding pics
Old 09-30-20, 07:15 PM
Join Date: Jun 2012
Location: USA
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The rth6580wf requires a 3rd wire for C/Common used to power it up. You either need a thermostat that uses batteries, run an additional wire to your hvac system, or use a device such as a common maker.

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