Honeywell T5+ Thermostat issue


Old 08-19-19, 09:02 AM
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Honeywell T5+ Thermostat issue

I have a Burnham ES2 boiler in the basement, a Honeywell T5+ Thermostat and a Bryant central AC unit with the air handler in the attic. I connected all of the following wires as they were on the original old thermostat. From heating unit: Rh and W. From A/C unit: Rc, G, and Y. I had an extra wire going downstairs to the boiler which I used for the C wire. When I connected it (the C wire)to the terminal block common post in the boiler, the thermostat came on, I can program it, and I can run the heat. However, when I turn on the breakers for the AC unit the thermostat shuts off. I cannot figure out where the conflict is so I put back the old thermostat for now. Any ideas?
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Old 08-19-19, 09:19 AM
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The conflict is that the C common MUST connect at the air handler or A/C system.
Old 08-19-19, 10:16 AM
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T stat

Get the manual for the stat and read to see if you can use a boiler with it. Boilers a a bit different and most stat companies make a bunch of models for different applications.

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