My one flashed due to a timer conflict, I'd set1 on1 at 7:30am, off1 at 8:00 am, on2 at 5:00pm and stupidly off2 at 10:00 am for Friday. the timer flashed and it wouldn't go on on fridays. Worked ok other days though.
A work by would be get a radio remote timer/thermostat and wire that in instead bypassing the boiler timer if clearing any conflicts doesn't work.
Ian Shaw
October 2008
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