Glow worm 30ci no DHW but CH ok

[nickname]

Hi to everyone.This is my first post,so...
I have problem with my Glow worm 30ci. ch working fine.When i open hot water tap boiler fires up but after 10-15 sec cuts off and red light and f9 flashes. When CH is on boiler working fine but when i open the hot water tap it cuts off after 10 sec and the water from tap is warm. I checked manual and F9 means water pressure sensor fault. Is this wright?

 

[combispecialist]

thats correct but ive also had f9 when the thermistor was out of range.get an rgi to have a look

 

[nickname]

Thanks for the reply.
Checked the boiler again and 3 way valve making quite big noise. Is it common problem on those boilers?

 

[mickyg]

Depends on the age of the boiler what the F9 represents. On older models it was a global fault. ie could be anything. Given the fault condition I'd be checking the DV and plate HE.

 

[nickname]

The boiler is about 7 years old. My friend plumber is coming tomorrow to look at it. Hope he will fix it.

 

[Andygasman2010]

Depends on the age of the boiler what the F9 represents. On older models it was a global fault. ie could be anything. Given the fault condition I'd be checking the DV and plate HE.

As above, on older versions of the PCB on this boiler F9 was related to overheat. Probably a blocked plate