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I have a Honeywell ST699. Is about a year and a half old. It now repeatedly resets itself to midnight, then goes on for about 3-4 hours, before resetting itself. What is wrong - do I need to replace it?

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Check to make sure the built in battery pack is working (holds a charge). Without a functioning battery pack, some timers will not work properly and will only operate for a brief time before resetting itself when the battery pack discharges.

Usually any timer that utilizes a backup battery to retain the program settings will require replacing the batteries or battery pack annually.

You can also check the Honeywell site for more details on your specific model number.

http://europe.hbc.honeywell.com/products/pdf/en0r8439uk07r0101.pdf

Posted on Jul 28, 2009

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