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C is actually a power wire; it provides power for some programmable thermostats. You don't have to connect it on the new thermostat; cover the end with electrical tape to avoid it causing a short. (If you keep that wire accessible, it will be nice for someone who wants to use another programmable thermostat. The ones which can talk to wireless networks require this wire.)
Do you have a heat pump? That is the only time a thermostat uses an E wire.
1) normally you must to exchange by new batteries with the same types alkalines FULL charges. 1a) see if there are some wires loose and tight it 2) reset and program it again , follow the instr. manual if you do not have download from Honeywell from section support give the number, model and do it.go to http://yourhome.honeywell.com/home/ God bless you
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