low shower pressure, Jaguar Combi boiler

[gazthecat]

Hi,

I've got a jaguar combi boiler; we had a problem a while ago, where the shower went cold; we fixed the rubber diaphragm (with a bike puncture repair kit!) as this had a hole in it, and this worked fine for a while; however, when we got a new rubber diaphragm and installed this, the shower lost most of its pressure.
The pressure in all the taps is fine, and they have hot water.
I'm guessing theres an airlock or something in the system, but its only effecting the shower, so im not sure!
Would be very grateful if anyone has any ideas!
Cheers, Gareth

 

[seco services]

whats flow like on fully cold ? fully hot ?
checked any filters on the shower ?
is the temp ok ?

 

[gazthecat]

the flow seems lower than it was both hot and cold;
no filters on the shower head (when you remove it there seems to be a mix of air and water coming through);
the temp is ok, though sometimes it goes cold after about 10 minutes

 

[seco services]

the flow seems lower than it was both hot and cold

is tha main stockcock or any isolation valves fully open that you may of shut when you done the boiler.

no filters on the shower head (when you remove it there seems to be a mix of air and water coming through)

filters will useally be on the cold hot inlets not the showerhead outlets.

do you know make/model of shower valve ?