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Why does my Siemens RDJ10 not hold the setting times for on and off?

I enter first time ON at A1 than time OFF at A2 by the time I get to A2 which is the second time ON A1 and A2 has changed to a different time entered by me, can anybody help please? my wife is starting to get frustaded with me!
Thanks

Newman
December 2011
SiemensHeating, Home Heating SystemsHold Times Time Second

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