valve stuck

We have an old Potterton Suprima 100L system boiler. Having just had our PCB replaced (can anyone give me a rough cost for that? I feel we've been overcharged!), our CH is running all the time. We're left having to switch it on & off at mains. Second opinion from another engineer feels it is...

Hi all, I believe we have a Vaillant Turbomax boiler although I'm unsure of the exact model number. The pressure has been low for a couple of years but only recently on a couple of occasions it has failed to fire up. I just pressed a button and it switched back on immediately. A gas safety...

I recently noticed that the Central Heating was not coming on when it should have along with the set program. The water came on okay and the central heating at the time. The water can come on, on its own, but the central heating can not come on on it own. I turned off the electric and the bar...