[SOLVED] Honeywell Chronotherm III "Replace battery" (2023 Update)

[Chuck Botts]

Put brand new batteries in the unit and it still flashes "Repl Bat". Cleaned the contacts and checked the batteries. What to look for?

[Sjouke Burry]

Chuck Botts wrote in news:2b4a3$517dc252$45499b77$ [e-mail]:

Check the nominal required voltage of the old and the new batteries. If the new battery has a different chemical construcyion, the voltage will be different.

[Stormin Mormon]

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. . "Chuck Botts" wrote in message news:2b4a3$517dc252$45499b77$ [e-mail]... Put brand new batteries in the unit and it still flashes "Repl Bat". Cleaned the contacts and checked the batteries. What to look for?

[trader4]

If they are the correct batteries, I'd be looking for a new thermostat. I'd let it sit without the batteries for an hour or so just to make sure it's fully reset.

[Zeugma]

replying to Chuck Botts, Zeugma wrote: Had the same problem. Replaced the batteries and the display still showed 'Repl Bat'. Fixed it by pulling the batteries, putting the unit back on the wall, then turning the power to the furnace off and back on. That cleared the display. Put the batteries back in the unit and all was well.

[ruth9490]

Thank you so much for posting this. I followed your directions and fixed my problem!

[barkster]

Wow, can't believe that worked. I have thrown away a couple because of this. Thanks

[Homeowner]

Exactly the same.. Other than it took a few minutes after power off for screen to reset, it all went perfectly. Thanks for the exactly right answer