Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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I installed a new Honeywell RTH74/75 series thermostat and it has the incorrect day displayed.

Today is Tue and it displays Thu. I have read the Operating Manual and quick installation guide with no luck.Some functions do not appear in the display to get to the DAY change function to change the day. Any suggestions would be great. If I take the batteries out and uninstall the thermostat, will it reset back to factory settings?

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It calculates the day based on the year/month/day of the month in the system setup. The first time it is powered on, it asks for year month & day of the month. After that you can get back into setup by: press & release the left button/ then press & hold the cente button until the screen changes (5 seconds). Now you see a number in the middle (function) and a number on the right (the items you can set). use the center (next) button to move up through the functions. 0120 is the 1st half of the year it should be 20 - function 130 is the second half of the year 15. ( use the up/down arrows to adjust if needed). 0140 is the month and 0150 is the day of the month. after you finish correcting the press the right button to save & exit.
https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-2487ES.pdf

Posted on Apr 17, 2015

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Yes it will reset itself when you do that, it really should not be too hard to figure out the day.

Posted on Apr 15, 2015

  • anna gunns
    anna gunns Apr 15, 2015

    And then also go to the reset button, the master and reset it to factory.

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This worked! Thank you! It was 49 degrees in the house, and now the heater is working again.

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Posted on May 17, 2009

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