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Rather embarrassingly, it turns out that one of the screws on the back of the control panel - I believe the gas valve commissioning screws - had been knocked to max output, meaning the boiler was in effect in a test mode running at max output permanently! All sorted now though. Thanks

Hello, I wonder if anyone could shed any light on this problem please. I was fitting a wireless thermostat to my Worcester 28CDi combi boiler yesterday. It all went smoothly until it was turned back on. Initially it seemed to be working. The thermostat was set to manual on and the boiler fired...