Piglet John or boiler knowledgable people?

[dancemom]

My Worcester boiler has an issue.
Hot water pressure and temperature fine in the kitchen, low pressure in the bathroom however and shower running low pressure and luke warm water.
Pressure dial on boiler was at zero when shower was on.
It's gone up slightly when I've put the central heating on.
I've got an engineer coming on Friday but anything I should do in the meantime?

pressure dial at zero suggests there is a leak on a radiator pipe or the boiler, or maybe the pressure vessel is deflated. I'm surprised the boiler actually fired up.

How high does it go if you put the heating on?

Still in the red zone between 0 and 1 but heating working fine

you can top it up a bit if you know how. If, when hot, the pressure then goes above normal, it's your pressure vessel at fault (it is suppose to keep the pressure fairly stable between hot and cold).

But that should not affect the temperature or pressure of the bathwater.

I definitely don't know how but I could find a YouTube video and give it a shot ...

Is it just the shower giving an issue or all taps in the bathroom?

Taps and shower