I have installed a Honeywell RTH230B thermostat-- heat worked great, AC won't come on. I have tried most of the solutions posted here to no avail, to include removing the blue wire and using a jumper between Rc and Rh
Wired as follows:
AT THERMOSTAT:
Rh= Red wire
Rc= Blue wire
W= White
Y= Yellow
G= Green
NO JUMPER
AT FURNACE/AC:
24V= Blue wire
R= Red wire
W= White wire
Y= Yellow wire
G= Green wire
Let me know what you think!!!! THANKS!!!!!
I printed out the instructions for your thermostat. It looks like you should have the following.
There should be jumper wire between Rh & Rc
Red wire to Rh or Rc whichever is easier since there is a jumper. This is the hot wire and all the thermostat does is connect to route it to the components needed for heating or cooling.
Blue wire, tape it up and don't use it. There is no spot on this thermostat for it. It is only used on thermostats that are powered by the transformer.
White wire to W. Powers the heat relay
Yellow wire to Y. Powers the cooling contactor
Green wire to G. Powers the indoor fan relay
There is a black jumper on the back of the face plate. Look at section 2.4 Setting J2 Jumper in the installation instructions. Make sure you have it in the right position for what you have. If you don't have them just google them.
Hope this helps.
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What kind of system do you have? Is it a heat pump or is it some type of furnace with a/c?
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