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Siemens thermostat rdh10rf/set-uk

Receiver & Transmitter units have worked fine for 2 yrs, now all of a sudden they are not communicating with each other but - and here's the strange thing - they still work fine every morning but only SOME evenings ( I have a separate programmer which is set to come on twice a day - mornings and evenings).The Green and Amber lights on the Receiver are on as usual so no obvious problems there. Despite that,I have re bonded the units a few times and managed to get the heating back on but the next evening or the one after that it stops working again! Spoke to Siemens tech helpline but the chap had never heard of such a problem before and suggested I get a plumber or electrician in. But that is no guarantee of a solution as I would need to get him round on one of the evenings when the units are not on speaking terms :-( Help appreciated.

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