Hot Water To Bath Running Cold

[jmck66]

The hot water to my bath is running cold. I have a combi boiler with no other hot water problems. It used to be absolutely fine. When I run the hot water, it runs luke warm, if I run the hot water to the basin after I try the bath tap, it's really hot, as if the hot water has backed up into the basin tap. Someone mentioned the diverter valve in the boiler but I just don't know. Plumbers seem to think there's nothing wrong with the pipe work. Any suggestions?

[The Builder]

What kind of bath taps do you have jmck?

[jmck66]

Builder, they're mixer taps - is that enough info?

[B00]

Mine does this too. I have to lessen the flow from the hot tap, ie, not run it as fast and for some odd reason this makes it piping hot.

I'm sure it's a 'small' problem that needs to be fixed by a professional, but so far ive not called anyone out to it.

[The Builder]

Sorry I've only just picked up your reply jmck.

I was wondering if it was mixer taps. A problem with a diverter valve will affect ALL hot outlets. Quite logical if you think about it. It's all 15mm pipework with a combi, so I'd rule out any flow problems.

I would say the mixer tap is faulty, allowing cold water to cross over to the hot side. Perhaps it's a "cartridge" type. The cartridge could need replacing. Either that, or treat yourself to some new taps.