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If boiler is in the attic and pressure dropped it's highly likely that there's an air lock in the boiler. Depending on the model there's either going to be a bleed screw on the outside of the boiler on top or inside the case of the boiler.
If you can find this and open it to let air out you've a good chance of getting it going again.
Obvs take care not to damage the screw, spill water onto electrics etc.
Nahguavkire
Buggeration.
My boiler went off, so I looked at it and the pressure had dropped. I duly wracked my brain and remembered which screw valves to undo to repressurise it. All good, it starts up and the water temp indicator goes up.
BUT, the water from the tap comes out cold.
I ache tried to ensure that I have closed the filling valve screws, but past that I am stumped.
Any bright ideas whilst I chase a plumber.
(My setup is extra annoying as the boiler is in the loft, a pain to get to and nowhere near a tap to check running water temperature)