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Hi, I have worked with Honeywell products for years, and I have seen this type on occation. If they are wireless and on a timer that controls them, it may have a problem in the timer. See if this timer is split to operate each stat seperately. If so, find where it controls the stat that will not shut off at the correct time, and see if you see anything out of order. The stat senses the temperature and would shut this unit off when satisfied. I did find that this stat works on the basis of time and temp, and is obsolete. They are being replaced by the Honeywell CMT-927. I do believe you need to check the timer 1st to see if it is working for this side of the stat. You will need to read the instructions that should be with the timer.If the timer seems to be working fine, I would replace the stat in question as it has probably failed and will not respond to temperature or time when it gets its signal to shut down from the timer. Please keep me updated on this and we can go deeper into this and solve it. Sincerely, Shastalaker7
for now, put switches on thermostat to hear and press the up arrow button to the desired temp. All your programed temps will take more explaining and it would be best you secure a owners instruction book from home depot. oif anything, buy thr same thermostat and either keep it or return it . I'd keep it regardless, read the pmphlet,program you heat and a/c before returning for refund. Don't destroy packaging and give them back everything. You will also need two AAbatteries. Good luck.
The Thermostat Wizard is an interactive tool that will guide you through wiring and troubleshooting your thermostat, as well as programming it to the most comfortable settings for you and your family. Simply answer the questions from the Thermostat Wizard to correctly connect, troubleshoot and/or program your Honeywell Thermostat. You can even print the instructions and bring them right to the thermostat to help make things easier. Go to: http://yourhome.honeywell.com/Consumer/Cultures/en-US/Support/Thermostat+Wizard/