I had a new combi boiler fitted a couple of years ago.
It worked beautifully until last week when it started to kettle. It cut out - presumably it tripped an overheat thermostat.
I was told by the well known company that the system needed desludging which seemed odd because I thought it should have been desludged prior to the new boiler being fitted.
Is desludging before fitting a new boiler optional, good practice, best practice or obligatory?
Should the pump circulating the water be fitted so the large screw is facing horizontally or vertically?
Since the well known company couldn't do anything for 10 days I looked elsewhere & on recommendation had someone do the job today
Â£Â£Â£s but I'm warm again and wish I had trained as a plumber instead of being a pilot