Hi, I just bought a Honeywell RTH8580WF1007 and tried to install it, I placed the wires in on the same letters as they were with my old thermostat. However, now that the new thermostat is wired up, it wont come on at all. I've tripped the circuit breaker a few times to see if that fixes it and no such luck. The wiring on the old thermostat was: C= blue, W= white, Y= yellow, RH= red, G= green. The new thermostat doesn't have an RH, so I put the red wire into RC. Any ideas? Thanks

Cover the bare end of the C wire with electrical tape so that it doesn't contact any of the other wires or parts of the Honeywell thermostat. The C wire carries continuous power from the red wire to some thermostats; this is required for some of the Smart thermostats (with the ability to communicate with your wireless computer network).

The installation directions for the thermostat include how to handle the C wire when installing the RTH2300B. You can find the manual on the product page in several places, including the Honeywell product site: https://www.honeywellstore.com/store/products/5-2-day-programmable-thermostat-honeywell-rth2300b.htm . The direct link to the manual is https://www.honeywellstore.com/store/images/pdf/rth2300b1012-u-5-2-day-programmable-thermostat.pdf .

I hope this helps.

Cindy Wells

Louise try removing batteries for 10 minutes, and reprogram,
manual link below , press the helpful button
Honeywell RTH8580WF User Manual

yes just make sure u relace all the wires in proper order, r-rc, w , y g,, remove one wire from old stat and install on new one or make drawing and write down all wireing colours and letters

WE R GOING FROM A HONEYWELL TAYSTAT500 THERMSTAT (HEAT PUMP) TO A NEW HONEYWELL to (WHOLE NEWHEATING/AIR CONDITIONER) WITH A HONEYWELL RTH8580WF1007 THERMOSTAT? WHERE WOULD THE C WIRE BE. WE DO NOT HAVE A WIRING SCHEMATIC FOR THE OLF THERMOSTAT. IT HAS 7 WIRES. HELP?

Not sure if your needing info on air conditioner or a thermostat but here is the link to honeywell. Just choose your product and model #. If it was the thermostat your replacing, look back at the old one and write down what wires went where. There should be letters/numbers by each connection. This will help with the new installation.
http://yourhome.honeywell.com/home/Applications/FindOwnersManual.aspx

http://customer.honeywell.com/techlit/pdf/PackedLit/69-2060EFS.pdf this should be the instructions for that t stat. best to just look at which color came off what letter and replace back on that letter. you dont know if the last guy wired it right

New furnace and new thermostat. The new thermostat is digital and it will not go above 67. It's a Honeywell RTH2300.

ALL OF TEM
EXCEPT L

What kind of system do you have (furnace with heatcool, heat pum or boiler )? Is there a themostat there now. How many wires does it have. If you have a furnace and you have heat&cooling install red wire to r on thermostat white wire to w and green wire to g. The g wire is usually for the fan. If there is a thermostat there now the old one should have the same letters on the back by where the wires hook up. The color of the might be diffrent than the ones i used for an idea.