Shower temps cold then hot and vice versa)

[Dunk1969]

Hi,Can someone get back to me as I've recently(6 months) had a mixer shower installed which runs off my combi.
Why does the water run hot and cold yet the pressure on the boiler is not falling and all the other taps are always hot aswell as the radiators.

Many thanks Dunk

 

[Bahco]

Ask others not to use the cold taps while you are having a shower.

 

[tryitandsee]

Can only give my best guess from information given. If your boiler has a diverter valve with diaphragm, it may be that the diaphragm is worn or holed. It often shows up on the operation of the shower first before the rest of the taps. (Less flow through shower, therefore not lifting diaphragm enough to make the electrical connection).