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Mend Siemens LX20 Heating Override Receiver

How can I re-bond Siemens receiver when instructions not work?

I have followed instructions about pressing override and learn buttons, but neither LED light on reciever comes on. Any ideas what else I can do as house is now very cold!!

HHailstone
February 2018
SiemensSiemens LX20Heating, Home Heating SystemsHeating Override Receiver

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