Baxi 105e Diverter Manifold Grub Screw - water leaking

[RobFurn]

Hi

I have a Baxi 105e (pile of pap) boiler. Water is leaking from one of the grub screws that connect the diverter manifold to the Pressure differential valve. Its only dripping but if I increase the pressure by adding water to the system then the dripping increases, Im having to top the pressure up every day as there is too much water leaking. I fitted a new diaphram to the Pressure differential valve recently, adding silicon grease etc. I dont have anything else I could comment on other then the water is off coloured suggesting that its from the CH. What could the problem be and how can I fix it Cheers.

 

[ChrisR]

It's a worn seal in the diverter valve. All the bits are available, solution depends what you find when you have it in bits.
Not a bad boiler at all, compared with some.

 

[RobFurn]

Do you think its most likely the diaphram again then or a different worn seal. P.S if i take the whole thing apart will i need to drain the system off before doing so or will shutting off the valves be enought Cheers for the advice.

 

[45yearsagasman]

The seal behind the pressure diff valve is leaking and can be replaced.
Heres a rough guide as to how to. There is a seal kit available. The valves on these boilers are usually ok after turning off and on again. Seal kit 760 is what you want.View media item 31064

 

[ChrisR]

The boiler's likely to be old enough now that other bits in there will have deteriorated. Have a look while you're there..