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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

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