Ariston Microcombi problem

[mulls76]

Hi all,

went to look at this boiler today and it keeps firing up and then cutting out constantly after a few seconds. Pump and fan are running ok, system pressure is fine and all controls are also working ok. Strangely the burner will stay on without the burner cover on which points to a problem with the air pressure in the combustion chamber when the cover is on but the fan is running fine and the flue is properly attached and free from obstruction. I'm thinking it may be a problem with the air pressure switch because everything else seems to be ok. I was hoping some of the fonts of knowledge on here may be able to advise!

 

[scatmanjohn]

Has the flue restrictor been removed from the flue turret.

 

[mulls76]

Hmm don't remember seeing a restrictor but will check on my return. The boiler has been in for a couple of years so i assume it's been working ok till now. Do you think it could be an APS fault at all? Thanks for your help by the way!

 

[sime10]

I would go for the APS same happens on sime's

 

[cowboydave]

I had the same problem with my ariston combi it was the electrode corroded i took the front off cleaned it up with some wire wool no problems eversince

 

[bobw1956]

check the flue terminal is not damaged, these boilers are sensitive to air supply

 

[mulls76]

Cheers for all suggestions guys, the flue seems fine and i'll check the electrode too just in case.