Got a Linea 28 with no hot water. CH all OK. Thing is I get no water at the hot tap! Checked pipework and no freezes. Boiler fitted to 1st floor. When hot tap in kitchen downstairs trned on, get slight trickle then stops! If I turn the hot off, wait 10 mins and turn on again, same small trickle to nothing. Diaphram has slight damage but cant understand why I'm not geting anything (or very little) from the hot taps! Checked cold water supply to the boiler via the filling loop and all ok so am pretty sure cold water supply to boiler is good! Anyone any pearls of wisdom pls? Muchas gracias