Hi Everyone,

I have a problem with our AC system, thermostat Robershaw 9500 (digital non programable) is stucked at 77 degree. No matter what setting I set, either I set anything higher than 77, i.e. like 79 or lower, i.e. 75.. the system keeps on running, producing cold air but the temp reading is on the thermostat still stucked at 77 degree.

This problem just happened this past Friday. System has been working fine for the past month since hot weather arrived. Perhaps, it's time to replace new thermostat. I open up and found the wiring as below.

RED connected to RC with a factory jumper clip from RC to RH
WHITE connected to W
GREEN connected to G
YELLOW and BLUE both wires connected to Y
B & O not used

I am thinking of getting another digital, non programmable thermostat from honeywell with same terminals, RC/RH/W/G/Y/B/O. My question is should I connect the same to honeywell the same as it was connected to old robertshaw thermostat. Meaning... YELLOW and BLUE connected to Y?

I'd appreciate anyone help.. thank you all for your time!

Chris

You can see what I am talking about 2 wires in 1 terminal. Please click on link to see pix.

http://imageshack.us/photo/my-images/444/photoagi.jpg/