I had a customer with a lock out issue, a combi in a loft, so he was going up and down every day to reset the boiler for more than a month during Christmas. Finally they had enough of it and put some money together to get someone in to sort it out. I went straight to the meter under the stairs, the space was proper jammed with anything you can imagine… The ECV was partially shut, that’s all it was to it. Happy days!