my combi boiler is not giving me hot water i have heating and all red lights are on when i run the tap but i still do not get hot water could the diverter valve be the fault?

linda, February 2011

Consider having the system power flushed if it is old (and especially if you have the micro piping) as a build-up of sludge can be an issue. It aint cheap at £400 but is better than a new boiller and worth doing even if a new boiler if later required. The plumber should be busy all day if he is doing a flush correctly.

wayne nelson, February 2014

I have just had this problem with the same boiler. It was the diaphragm. I have no idea what that is or what it does but it has now been replaced and I have hot water! However the plumber was in my house for 3 hours and it seemed to be less than straightforward to replace. Now a day later the pressure in the boiler has dropped to 0 and despite repressurising it, it has continued to drop to 0. I have called the plumber back to sort this and am bracing myself for a huge bill. Hope that helps!

Rebecca, February 2011