ferrolli sigma air flow prob

[dwb78]

hi am i correct in saying that the said boiler only lights with the cover off. is this an airflow problem possibly a blocked venturi. any ideas before i travel 30 miles

 

[wnjswozo]

its got to be a flue promblem,fan,venturi
you need to take fan pressure reading,check venturi,aps,flue seals,check if restrictor fitted on flue

 

[Billy Bob Bob]

or a broken venturi plastic dont forget very prone to breaking up

 

[oldplumber]

or a broken venturi plastic dont forget very prone to breaking up

As I found out when doing a service and foolishly removed the fan to give it a clean on a late friday afternoon when I first started on boilers. Luckily Pcenter left me a venturi under the wheelie bin before they all went home, so I got the wretched thing going again that evening, grateful custards never got me back next year to service that heap of rubbish tho.

 

[Billy Bob Bob]

your better of not going back dont like ferrolis

 

[oldplumber]

I tend to agree, although I was hoping for a new install needed shortly

 

[dwb78]

ok thanks everyone. just replaced the fan, everything was clean as a whistle. the fan just seemed it wouldnt get up to speed. tho i have seen pcb problems giving same problems. the joys

 

[PaulGas]

How did you find replacing the fan?? (Or fitting the existing fan back in) We work on these most days the the fans are buggers to get off sometimes!

 

[Billy Bob Bob]

How did you find replacing the fan?? (Or fitting the existing fan back in) We work on these most days the the fans are buggers to get off sometimes!

especially when the locating tab breaks