Recent content by marrich

Have just checked the rise and fall on the differential switch and it is working properly but still no ignition. The manual says to replace the board but the connections were checked yesterday and found good. Have spoken to the receptionist at vaillant.co.uk but will email the engineer for advice.

Thanks to you both for your advice. He installed a new differential switch and said it was working properly. The boiler lit for about 15 minutes during which time I paid him. It then went back to showing the 'egg timer' and he asked me how far I wanted to go with the diagnostics, saying he could...

Thanks for that. Yes, it is the egg timer icon. I had a plumber in today and he has replaced the differential switch and cleaned some tubes. He checked the pump and it's clean and working well. The system re-lit for 15 minutes and then stopped again - cost me over £200 and I now have to decide...

CH was working but the boiler just fires up and cuts out now. There are some burbling noises. We had the expansion chamber re-pressurised about four weeks ago - wondering whether the unit is caput?

Our boiler was recently serviced because it had been having a problem with the expansion tank - now fixed. The problem now is that the boiler lights for about 20 seconds before cutting off and the water circulation light comes on. Could this be the mains water feed and if so, what do I do? Thanks.