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I'm still not electrocuted ;) also put some insulation on those not used wires. Thanks for all replies. Quite strange but the boiler started working again yesterday evening. Before it "fixed itself" I tried shorting y+r but it did not help. Then I also noticed that the hot water demand light was...

Yes it's a wired thermostat. Just unscrewed it and it looks like this: Only yellow and red wires connected to thermostat, and ground to the box. So just short y+r? Timer on boiler is set to constant heating.

Hi, My boiler just stopped heating Today. As mentioned hot water is there, I also hear the pump working. I have a simple mechanical thermostat on the wall but turning it on / off does nothing - I don't hear the diverter valve motor triggering. The CH demand light is off, no error is shown. Any...