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Siemens RDH10RF wireless room thermostat not working?

My Siemens RDH10RF wireless room thermostat receiver unit does not show any lights. It was working perfectly a few days ago. It is getting power as I can hear it click when the heating comes on. Has the unit developed a fault? Any suggestions please?
Meic, January 2013
After replacing batteries, Do the relearning / re-pair the RF once again and see if it works.

Miri, August 2013
try replacing the batteries

Toptrish, January 2013
link Click here to see other fixes for Siemens.