Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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Installing a Honeywell TB8220U programmable thermostat. All of the wires are connected but AC will not come on. I believe I have a single-transformer system. I have the red wire connected to ''C'', since there is no ''R'' on the unit.

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On the old thermostat how many and what terminals did you have?
Usually
R = Red One Side of 24 volt Transformer
RH = Usually jumpered to R or RC
C = Common the other side of the 24 volt transformer opposite the R
G = Green Blower
Y = Yellow Cool
W = White Heat

Posted on Jun 01, 2010

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I have a TB8220U comm prog stat used on a oil burning furnace and a-c unit but the fan on the furnace runs all the time when a-c is off can you help me ?

Posted on Apr 30, 2011

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