My older Honeywell Chronotherm III thermostat is flashing. I have replaced the batteries and tried to reprogram but it won't let me do anything, it just flashes the present hold temperature setting.

W

Remove stat from wall. Remove batterys from stat. Make sure batterys are good. After a few minutes replace batterys CORRECTLY + and - and try to program stat. Replace stat on wall. If that does not work it might be time for a new stat.


http://www.gogeisel.com/geiselonline/support/Honeywell/T8621.pdf




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