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Hi Paul, All getting a bit confusing now.... I do not intend to adjust the APS and had not taken that as your advice either. It is all working OK now, and would not adjust it anyway without all the correct equipment for the reasons you state, and on the grounds an APS is unlikely just to go...

So I think we are agreed on that then, and like my previous post states I was not going to fiddle with the APS adjustment as I did not have the correct equipment to hand, and like I think what your saying is that any adjustment using correct equipment should be made as to trigger (go o/c) the...

Paul, Not sure they are set up that closely tolerance to start with, there is indeed a pressure threshold it should switch at (180 pascals)and as soon as that triggers and goes o/c the burners drop out (no timer involved on drop out). Although I can't see the manufacturers calibrating every...

Still suffering

I removed fan... it was spotless checked venturi and tubes they too were spotless, checked operation of APS by gently blowing/sucking down pipes and it operated as it should (no way of knowing at what pressure though). Refitted everything ensuring flue to fan seal seated correctly and fired up...

Olski, I have not yet tried that, I assume that would indicate a flue (air in) restriction. ?? I hope not as that may mean a trip on the roof !!! don't you just love doing that !!

Thanks ASC... I can only assume the venturi is holding up as the boiler is only about 3 years old and has not become too brittle yet. As for the operation of the ASP, I believe that its the fan running is what creates the pressure differential and operates (closes) the APS micro switch. I...

ChrisR, Yeah so it seems... fix one problem and find another 3 .... is there anything unusual that you have to watch when removing/refitting the fan like seals etc or is there any seal that could be disturbed/damaged causing an incorrect pressure differential that would trip the APS. As...

Ok will strip fan out tomorrow and check tubes and let you know the outcome. If there are no restrictions in flue and tubes and the fan runs up OK then can I assume the APS has gone out of cal and needs replacement or do I need to get hold of a electronic manometer first ? Like I say if the...

Thanks gordongas... boiler has been installed for 3 years and has no restrictor ring due to flue length and has operated OK until the last few days. Is there any way to test pressure differential without an electric manometer ?

Can any one advise me on how to test the APS on a Ferroli F30. Reason... the boiler keeps dropping the burners out after running for 10-20 seconds but if you bypass the APS then ithe burners stay lit and boiler runs and appears to modulate just fine. The manual speaks of the air pressure...

I have a Ferroli F30 about 3-4 years old and just noticed that after the heating system gets up to temp, and the boiler refires up the burners light up as they should but soon after (15-30 secs) they are dropped out again and then relit a few seconds later it is as if the burner is being...