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Ah, yes a faulty battery would explain why it kept losing it's memory after the circuit was tripped by a dodgy washing machine. I will try this before splashing out on a new unit, many thanks, gas4you! :D

Sorry for delay, it's an ST699B. Anyone have any idea if i can directly replace it for a better programmer without altering the backplate and wiring etc? Cheers

Hi, first post so go easy on me, have enjoyed lurking so far... i need to fix/replace my aging parents CH/HW Honeywell programmer as it keeps resetting it's clock and messing up the on/off times. Can i replace it with a more intelligent one without changing the wiring? Going to see them today...