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Boiler is a Worcester Greenstar Heatslave II External 12/18 ErP+ Brand new boiler out the box, ready for commissioning but as soon as there’s power, the boiler doesn’t give any digits or letters. Not had this problem with previous models. Boiler led light on the screen flashes green and off...

Thanks mate. Had a look myself and it looks asif the thermostat has been connected with the mains and not in the correct terminal

Hi, I’m having issues with my Worcester boiler. It’s a Greenstar Heatslave II combi boiler running off oil. It’s all new and installed but the problem keeps occurring. Basically when the power to the boiler fires up, everything is good. The room thermostat light has to be on for the boiler to...