Question about Honeywell Programmable Thermostat Heater

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Can't Program Clock for Honeywell RTH230B Thermostat

I just installed new batteries and went to program the clock by holding in the clk button but the hour, minutes and day all blink and I cannot change them. Help!!

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  • zitogp Oct 06, 2008

    I have the same problem. Installed new batteries and now clock readout continuously blinks and I can't stop it or change it.

  • samf56 Oct 09, 2008

    Same problem! It seems none can fix it?!

  • gregarious1 Jan 31, 2009

    I have two of these and encountered teh same problem on both - on one of the units I finally managed to get it into "set" mode, but have no idea how I did it as by that time I had been pressing various combinations of buttons and switches for 20 minutes. Honeywell's support site was worthless in resolving this....

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After you set the hr, min, and day, press the mode button.

Posted on Dec 21, 2009

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Posted on Jan 02, 2017

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