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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


Answers :

Hi,
\012maybe a blown fuse if it has one... if not then you blew the transformer...
\012Check on the circuit board in the furnace or air handler for a fuse...
\012if there isn't one... then you will need to replace the 24v transformer... they blow very easily...
\012
\012heatman101

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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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