water in air pressure switch???

[gary--82]

Hi I went out to a Main combi 30 HE today and there was water in the air pressure switch? The tenant said it is a regular occurance (weekly) and he disconnects a hose on switch and sucks water out, when it is put back it works fine. I have never heard of this one so any ideas on what could be causing it??
Condensate and heat exchanger seen clear?? Many thanks, Gary.:hammer:

 

[Billy Bob Bob]

whats the flue fit like? if the flues turned slightly this can cause it

 

[gary--82]

Thanks, I didnt notice if it was but i shall check 2moro

 

[Billy Bob Bob]

things to remember with this boiler the flue should be level not fall back to the boiler and the terminal must not be at a angle exposing the air duct to the elements

 

[Hardy1]

things to remember with this boiler the flue should be level not fall back to the boiler and the terminal must not be at a angle exposing the air duct to the elements

whys that gasman why should it be level? ive always told to fit the main 30 with a slope regardless

 

[Billy Bob Bob]

whys that gasman why should it be level? ive always told to fit the main 30 with a slope regardless

because its a band band the fall is built into the flue elbow,even a slight fall back can cause water to run into the fan and aps