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 Post subject: Mixer Shower going cold.
PostPosted: Tue Jul 17, 2018 8:43 pm 
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All.
Hopefully you can help with this. I have mixer shower taps to my bath, supplied by a combi boiler.
Very simply:
Turn on the hot water and the hot water is plentiful and the combi will run all day.
The moment you touch the cold water, then virtually the hot water stops as the combi turns off
Eventually the hot water in the pipes flushes through and the cold water takes over. Abuse from my wife most days - 7am!
As the cold water tap is turned on, it seems that this prevents the hot water coming through, the temp rises to 76 (then cuts off assuming in safety)

The combi is well serviced and the engineers explain the combi runs ok. One bout of guidance was to change the mixer taps and in truth - over 12 years old. However, I changed them but to no avail. Further abuse from the wife!

Come on you guys/girls out there - there must a solution, it cant be rocket science / or is it?

Waiting your feedback, more the better please.

Thanks, Tonk.


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PostPosted: Tue Jul 17, 2018 9:33 pm 
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I am NOT a plumber or heating engineer.

A few questions

How long has this been happening?

Have you changed anything prior to this happening

Are you sure?

I can't help but wonder if the cold tap is "pinching" the cold water that should go to the boiler, so as it gets no cold water to heat up, it switches off.

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PostPosted: Tue Jul 17, 2018 10:57 pm 
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Some good points, especially the latter and never really thought about this side of matters.
It really has been going on for along time (More than a year!), but I cant point it to one particular change.
Lets wait for further feedback, thanks for your note.
tonk


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PostPosted: Wed Jul 18, 2018 4:04 pm 
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What make and model combi do you have?

Is it just this one shower that is affected, or do any of the hot taps run hot/cold?

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PostPosted: Thu Jul 19, 2018 8:31 pm 
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Dave, thanks for this -Worcester Greenstar.
We have two showers, one in the converted loft with little consistency.
Reading your note, I just popped up stairs - Turned the hot water on - shower mixer (no cold at this point) and watched the temperature go up to 79oc and then cut off. This is not typical, if truthful.
Anyway, started again, switched the hot water off.
Turned the hot water on - shower mixer, went to approx. 70oc and remained there. Turned on the cold water in the bathroom from the sink, within a moment, boiler turned off.
Same exercise again, this time turned the cold mixer shower on, within a moment boiler turned off.
So, is this a fault with the boiler? I'm with Shropshire Gas on their maintenance plan.
Thanks Tonk

Dying to sort the issue, Tonk


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PostPosted: Sun Jul 22, 2018 8:30 pm 
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Come on guys and dolls, does anyone have a solution - please please


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PostPosted: Sun Jul 22, 2018 9:09 pm 
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Why can't you ask shropshire gas to look at it? after all you did say

tonk wrote:
I'm with Shropshire Gas on their maintenance plan.

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PostPosted: Sat Jul 28, 2018 4:39 pm 
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All out there.
I don't seem to be getting anywhere..... Is it down to Shropshire Gas to correct considering I pay them a monthly fee.
Is the problem pointing to the plumbing, that could be deemed out of their control
Could it be the boiler? They claim not, however, they would.
Remember the simple problem. Turn on the hot water tap = flowing undisturbed hot water. Touch the cold water tap = hot water stops flowing as boiler switches off. thanks


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PostPosted: Sat Jul 28, 2018 9:01 pm 
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Hello all.
Tried this on the plumbing forum – but never received the answer I needed:
Simply, when have a showing using a Worcester combi boiler, turn on the hot water for the bath mixer tap to the shower and the hot water will indeed flow perpetually...
Add some cold water to make the shower a more manageable temperature, boiler stops working for 30 seconds to 60 seconds. Shower goes cold!
Temperature does goes up and then goes down again, hot water starts flowing.
Any ideas.
Virtual beer or two for best guidance. To date, no one has directed me in the right direction!
Thanks


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PostPosted: Sat Jul 28, 2018 9:18 pm 
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What model Worcester is it?

How long has it been going on?

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PostPosted: Sat Jul 28, 2018 10:02 pm 
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Thanks Dave
Greenstar HE plus
Yonks is the other answer - many months - Year , truly to my wife's despair
Recent visit from Shropshire Gas = Guidance; try changing your mixer taps, I did, to no avail!!
£100 later
Cheers.


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PostPosted: Sat Jul 28, 2018 11:18 pm 
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My first thought would also have been the mixer tap.

Do you have any other mixer taps e.g. kitchen, and if so does it do the same with them?

What happens at a standard basin or sink with separate hot and cold taps?

Does the boiler go off if the hot tap is running and the cold tap turned on?

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PostPosted: Sun Jul 29, 2018 7:24 am 
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Just one thread per topic please. I've merged these 2.


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