Tech found zone control in flash code for lockout due to limit trip, tech tested limits and found no issues, tech performed test on sequencers and blower and found no issues. Tech tested heat strips and verified proper operation, tech found diagnostic sheet for Honeywell zone board and went through steps of diagnostic. Tech found Honeywell zone controller to have failed. Tech reset system and everything comes on and works properly, tech informed customer how to reset issue so he can keep heat until we can get zone board.