Increasing pressure...similar to other thread

[Ceebeegee]

Hi,
I've got a Worcester boiler fitted two years ago which is still under guarantee.
It was making a bit of a wheezing noise and I noticed the pressure guage was between 2 and 3.
I had it serviced by the fitter but he didnt mention anything about the pressure, he said if I was concerned to call Worcester out under guarantee.

I asked Worcester to check it out under guarantee, they said they couldnt find anything wrong but something about theyve put it into service mode and reduced the pressure to 1.5.
Within two days, the pressure is back up to nearly 3 bar.
I've bled the radiators but there wasnt any air - when i turned the radiator key, it was only water that came out.
So, whether the boiler is on or off, the pressure stays around 2.5 to 3 bar, is this normal?

Tagging the mumsnet legend of @PigletJohn to get some advice : - )

Incase PigletJohn doesnt see this. The gauge has a green optimal pressure zone If i remember correctly, 1 & 2 are in green & 3 possibly at the top of green heading into the higher zone, but still acceptable. Id say its fine. It will fluctuate as heating comes on & off but this is normal. You should keep an eye on it & re pressurise if it drops below the optimal zone. Have you not been shown how to do this? It's very easy. There are usually 2 taps behind the boiler. You can probably find a tutorial on you tube but unless the pressure drops very low I wouldn't worry & get the person who services it to show you how do it next time you have it done.

Turn the boiler off and let all the rads go cold. What is the pressure reading?

Turn the heating on and let all the rads get hot. What is the pressure reading?

Have you got a hot-water cylinder? What colour?

Have you ever used the filling loop to put the pressure up?

Hi thanks for your replies.
I've never needed to top up the pressure because it's never gone less than 1.5.
When the heating has been off all day , the pressure is just over 2. When the heating comes on and has been running for 15 minutes, the pressure goes to 3.

It's a combi boiler, no cylinder.

Our problem seems to have been as PigletJohn advised in the other thread - the expansion vessel needed inflating and pressure valve changed. Maybe ask them to look at those specifically?