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Which model room thermostat do I need?

I have a Worcester Green Star 37cdi combi boiler. The room thermostat controller is showing an E1 fault so I need to replace it. Which model thermostat do I need?
Sue, November 2018
https://www.youtube.com/watch?v=S0NOpRwiEHk

zsdvsdv, November 2018
link Click here to see other fixes for Worcester 37cdi.