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Hello and thanks for using this service, if you have been waiting do not worry or get upset I am just one of the techs on here and I try to get to as many customers as I can and I just picked up your question now. Please give me time to respond sometimes I get your replies late so there may be a delay in my response.
Shut the power off to the unit for 30 seconds then try it and check the low voltage fuse on the unit, if it still displays that code the board is bad, not much else causes that code other than a bad board something likely happened to it when you were switching the thermostat wiring.
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