Worcester fan replaced, pressure now dropped / air in pipes / constant need to top up

[Marcusblanc]

Hi, We recently had a Worcester compact system boiler repaired under warranty where the fan had failed. Since this has happened, the top floor radiator has needed bleeding constantly and additional water added to the heating loop. There's no apparent leak. I'm guessing the boiler is releasing this water to the overflow, could a fan swap have caused this or is there a setting that i can change etc. Could the engineer have forgotten to do something or re-calibrate ?

Should i have Worcester out again themselves to put right or is this a job for our heating / plumber regular?

Thanks for advice in advance.

 

[ShaunCorbs]

no fan swap doesnt touch the heating system / water

easy to tell if it leaking out from the boiler outside you should have a copper pipe (15mm) is this dripping?