by BillMartin »
Fri Sep 10, 2021 2:56 pm
My gas central heating/hot water system was making a lot of noise in the area of the pump and diverter valve and sometimes the radiators were hot when the heating was off. It was due a service but I could not get hold of the engineer so paid £102 for a weekend call-out to another. He could find no problem at the time and even took a picture of the expansion tank to show that it was clear. The service engineer came a couple of days later, immediately diagnosed the problem and replaced the diverter valve, cleared the T-junction above and cleaned out the expansion tank, showing me 3 buckets of very muddy water. He also took a picture of the then empty tank to show the muck in the bottom. On contacting the first engineer, they said that there is a tendency now for some engineers to clean the tanks but there is no need. So, who is to be believed?
