Thanks all for your advice.
Gas pressures were fine, so I decided to clean the plate HE for a second time...
And problem solved!!
Very strange as I'd already cleaned it, but more gunk came out. I guess there was more debris in the pipes from the time the system wasn't used or i...
Hi All, this is my first post, so forgive me if I don't get the protocol quite right...
I'm repairing a Vaillant Turbomax Plus 824e for a client and have come across a problem I've not encountered before.
The boiler was unused for a long period of time and had a couple of standard problems...