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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Tom, trying to install new RTH221 thermostat, but old thermostat

Customer Question

Hi Tom, trying to install new RTH221 thermostat, but old thermostat wiring was not labelled. I have about 6 coloured wires at the wall
Submitted: 2 years ago.
Category: HVAC
Expert:  Phil replied 2 years ago.
Hello,If you can send me a clear, well focused, close up photo of the wiring diagram glued inside the blower cover door on your furnace or air handler, and a photo of the printed circuit card that shows where the thermostat wires connect I can help you by marking it up with trouble shooting instructions. .

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