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Thank for every ones help I will have a look for a new ST699 or ST799 if it will fit.

I’m looking for a bit of advice on the Honeywell ST699 timer. I think I have the right model number. The problem is that the clock will change time by it’s self. e.g. AM to PM or might jump one or two hours. Will the battery need changing in it. Is there a reset for it? If so were. Is the...