Combi-Boiler, shower mixer running Cold but all sinks are ok

[Eds2eeb]

Please help!

I have a combi boiler in a new build flat (2.5 years old) and the mixer in the bathroom produces a cold bath/shower whilst the other taps produce very hot water. Perhaps it's a high pressure problem but I don't know and more importantly I don't know how to fix.

The pressure on the older is just above 1 bar and I have put the temperature up to 65 degrees.

To check the flow rates I filed a mop bucket in the bath with hot water and it took around 93s whilst the kitchen sink filled it in around 76s.

I'm baffled to be honest and I really want a hot bath!

Thanks in advance.

 

[picasso]

As your flat is nearly new chances are you have a thermostatic mixer tap or a blending valve under the bath, is there a dial or lever on the tap to adjust the temperature ?

 

[Eds2eeb]

Hi, yes the tap does have a temperature control dial/stick on it. It looks very similar to this

http://www.jtspas.co.uk/moods-jet-brassware-bathshower-mixer-tap-129-p.asp

I haven't got underneath the bath (I can't say I know how but will look into it). If can try tonight but what am I looking for and what do I have to do?

Thanks

 

[Agile]

Check that its not just a flow issue! Run the shower at the same time as a hot tap on half flow.

Otherwise it could be a failed temperature control cartridge in the shower. They can often be cleaned by a descaling chemical if its due to lime scale. that varies according to your local water supply.

Tony Glazier

 

[Eds2eeb]

Thanks for the suggestion.

I tried running the bath/shower at full power turned to hot with the bathroom sink half way (both hot then cold) and likewise with my kitchen sink. No joys!

Something is strange and its slowly happened over the coarse of a year maybe (I've just been lazy to be honest as I have an electrical shower in the ensuite). When I first moved I could get a hot bath no problem and little has changed but time! (Unless Scottish water have done something major to the water in that time)

I really don't want to call a plumber and throw money away if I could do it myself!