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Hi I am trying to help a friend out with a Boiler Issue. We don't know the model number of the Boiler however I have attached images. There is hot water but the heating has not worked since May and multiple engineers have not been able to resolve the issue. If anyone has any ideas no matter how...

Hi I don't have a working thermostat and need to turn on the heating on my Vaillant boiler without it. Is there a way to turn it on so that it stays on? (Not 'Chimey sweep mode') because that only stays on for 20 minutes or so.