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Why does my Digistat RF2 have a blank screen?

My Digistat RF2 does not show the control settings on the screen (just a blank screen) and is not working as a thermostat. We are using the override switch to control the heating. I have tried new batteries, but this hasn't helped. Any ideas?
Mary, January 2009
the battery connections are either dirty or bent

Paul the gasman, January 2009
link Click here to see other fixes for Honeywell RF2.