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i have a Honeywell ST6400C timer that has been working until now, the neon light between the hot water extra hour and override button is constantly flashing. Consequently we have no hot water or heating.
Digital programmer with a blue neon light ? If so it needs replacing . I've replaced loads which haven't even hit a year old , Honeywell say dodgy component which they have now apparently sorted , easy to replace just undo the 2 screws on the bottom and replace with the same
No probs ..... Just don't get the one that says st9400s as this one has inter grated service reminder and I can't b bothered to explain how to disable it lol
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