Question about Honeywell Programmable Thermostat Heater

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We installed the honeywell rth230b. The fan is working, but it's not turning on the outside unit We disabled the blue wire, and red, green, and white are in - we don't have yellow. Sometimes when we push down on the thermostat the outside unit starts up for a split second, then dies. And it only starts for that split second if you have the fan in Manual, not Auto.?? :-)

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  • 135 Answers

The terminals on the stat are:
G is fan
W is heat
Y is A/C
C is 24 volt common
R is 24 volt hot-if there is a Rc and Rh terminal, male sure that the jumper is in place and hook the red wire to either screw.
It sound to me that someone was using the blue wire as a yellow. to double check open up the fiurnace or air handle and see what the blue wire is connected to, if it is connected to the yellow, then hook the blue wire to the Y terminal at the thermostat.
If this has been helpful, please rate me and contact me back if you have any more questions,
Sincerely,
Paul Gibson

Posted on May 03, 2010

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