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How to fix Siemens RDH10RF wireless thermostat?

The red signal light keeps coming on and stopping my heating coming on. We've changed the batteries and its still not working
Sian, March 2013
Do the relearning / re-pair the RF once again and see if it works.

Miri, August 2013
link Click here to see other fixes for Siemens RDH10RF.