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RTH221 honeywell thermostat install, hooked up blue wire from old thermo that hooked to C to o/b connection on new thermostat no work did I screw something up as old thermo will not work as well now. was not supposed to hook blue wire up I found out later on Internet. any easn fix, blown fuse??? etc. Thanks

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  • Honeywell Master
  • 43,501 Answers

Hi,
maybe a blown fuse if it has one... if not then you blew the transformer...
Check on the circuit board in the furnace or air handler for a fuse...
if there isn't one... then you will need to replace the 24v transformer... they blow very easily...

heatman101

Posted on Aug 05, 2010

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Posted on Jan 02, 2017

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HONEYWELL WEBSITE:
Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
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Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
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