Pressure problem with Baxi Combi Boiler 105e

[RichieK1]

Hello, I have recently started to have a few issues with my Baxi Combi boiler 105e. The first sign was that the outlet was continuously dripping. I called a plumber in and he noticed that the inlet valve had been knocked a little so was continuously letting water into the system. He then also replaced the pressure release valve.
This has sorted the drip, but I now have problems with the pressure. When the heating is not on, the pressure seems to drop off to pretty much zero. This seems to make the boiler struggle when hot water is needed. However, when the heating comes on, or is switched on, the pressure increases.
My plumber told me the system needs to be at 1bar when its cold for it to still work, so when its low, I top the system up. However, this often causes the pressure to rise above the recommended 2.5bar. It all seems a little all over the place!!

Any help would be much appreciated.

Thanks.

Rich

 

[1958johnp]

Hi had same fault a few months ago - very easy to rectify.
Drain down one radiator to relieve all pressure in system and leave drain valve open with bucket underneath.
On the top of your boiler at the back you will find the expansion vessel ( a big rubber diaphragm with a shraeder valve similar to a car tyre valve )
This needs to be inflated to 10 psi.
After inflating close radiator drain valve and re-pressurise your system to 1 bar and this should cure your fault.
regards john.

 

[JPC]

as long as the ev is not split