Honeywell RTH6580 thermostat issues.

Old 02-21-15, 06:53 PM
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Honeywell RTH6580 thermostat issues.

just bought two wifi rth6580wf....

there was an unused blue wire so i used that for C... i did all the wiring according to their diagrams...

switched breaker back on.... nothing... blank screen.

love to know how you resolved this, if at all...

many thanks!!!
Old 02-22-15, 12:40 AM
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Welcome to the forums.

Did you just assume the blue was common or did you actually confirm it at furnace/air handler end ?

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