worcester 24i junior not greenstar wont fire up

[bawsdogg]

hi guys i went to a customers today to have a look at her boiler. when i arrived the boiler was not firing up no fan spin or anything. i removed the red pipe off the venture and made pressure to ap switch the boiler fired up. and run fine until i let the pressure out of the pipe. i have not worked on these boilers for a few years ..am i right in thinking that the fan should spin first on demand then activate ap switch then fire up? BTW the fan does not seem to spin full speed.
i was wondering if it could actually be low water pressure switch
any advice would be gratefull as this lady is a pensioner and does not have money to throw parts at it ......thanks guys

ps also she has no filling loop key what pressure will the low pressure water switch active it is currently just under the 1bar make giving it is acurate ?

 

[lame plumber]

sorry have a read of the banner on top of the page. Judging by your question, should you even be looking at a boiler for a customer?

 

[Dotty]

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