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Thanks to Bob from https://groups.google.com/forum/#!topic/uk.d-i-y/EcWghRHtrqk The usual press time+ and select wasn't working, the battery inside would prevent a full reset so this procedure does a total system reset. Mains off Unscrew with flat screwdriver the holding screw at the...

I have a Tempus 7 Timer says 1E:00pm both hot water and heating indicator arrows are stuck on ONCE and CONT Mon 10:EE bottom 1E:00pm both hot water and heating lights are permanently off. All buttons and indicators are frozen. Fuse is ok. I have tried pressing all 4 2nd ON and 2nd OFF buttons...