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mixer shower temperature problem - going hot/cold


 
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briwall1

from United Kingdom

Joined: 05 Jan 2009
Posts: 6
Location: Herefordshire,
United Kingdom

PostPosted: Mon Jan 05, 2009 6:04 pm Reply with quote

Hi,
I have a Potterton Performa 28 combi boiler and a gainsborough mixer shower.
The problem I have is the water temperature changes from hot to cold then back to hot.
I had the same problem with a gainsborough thermostatic shower and changed it because I was told the problem was with the shower not the boiler.
We have a service contract with British Gas and it was one of their plumbers who told me to do this after he had checked the boiler.
The boiler is apparently running as it should so no problem there but how do I get over the temperature problem - do I need to fit a pressure reducing valve on the cold water supply to the shower?
Any help would be greatly appreciated.
Thanks
Brian
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Dusty4018

from United Kingdom

Joined: 05 Jan 2009
Posts: 5
Location: West Glamorgan,
United Kingdom

PostPosted: Mon Jan 05, 2009 6:13 pm Reply with quote

Does the problem occur when there are other demands on this cold supply IE toilet re filling, kitchen tap turned on, washing machine on etc ?.

Do you know the hardness of the water in your area.
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bengasman

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PostPosted: Mon Jan 05, 2009 6:22 pm Reply with quote

when you run bathtap, does it stay at an even temperature?
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briwall1

from United Kingdom

Joined: 05 Jan 2009
Posts: 6
Location: Herefordshire,
United Kingdom

PostPosted: Mon Jan 05, 2009 7:21 pm Reply with quote

Hi,
There is no difference if another tap is run or the toilet is flushed.
The water is quite hard here, does that make a difference?
Thanks for the replies
Brian
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bengasman

from United Kingdom

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PostPosted: Mon Jan 05, 2009 7:35 pm Reply with quote

Actually I meant: all taps closed apart from only hot bath tap; when you hold your hand in the flow, does it stay even or does it go up and down too?
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briwall1

from United Kingdom

Joined: 05 Jan 2009
Posts: 6
Location: Herefordshire,
United Kingdom

PostPosted: Mon Jan 05, 2009 7:47 pm Reply with quote

Hi,
Just tried it with only the bath hot tap running and the shower stays cold, it doesnt fluctuate.
Thanks
Brian
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Dusty4018

from United Kingdom

Joined: 05 Jan 2009
Posts: 5
Location: West Glamorgan,
United Kingdom

PostPosted: Mon Jan 05, 2009 10:35 pm Reply with quote

Brian,

thermostatic shower units are normally made using two different materials, one revolves inside the other. As limescale damage increases with water temp it is possible that some of the working parts (on the hot side) are becoming scaled up & preventing smooth movement. This will effect the operation. How old is the unit. ?
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briwall1

from United Kingdom

Joined: 05 Jan 2009
Posts: 6
Location: Herefordshire,
United Kingdom

PostPosted: Tue Jan 06, 2009 8:44 am Reply with quote

Hi,
I dont have a thermostatic shower, I changed it on the weekend after the gas board plumber told me it would be faulty.
I changed it for a normal mixer shower thinking if there was no thermostat the boiler would control th ewater temperature.
Incidentally I have tried it this morning with the cold tap running in the basin to see if that would lower the cold water pressure but it didt make any difference as the shower still went hot and cold.
Thanks
Brian
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diy

from United Kingdom

Joined: 21 Dec 2008
Posts: 47
Location: Lancashire,
United Kingdom
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PostPosted: Tue Jan 06, 2009 9:22 am Reply with quote

when you run just the hot tap, does the temp stay even.
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briwall1

from United Kingdom

Joined: 05 Jan 2009
Posts: 6
Location: Herefordshire,
United Kingdom

PostPosted: Tue Jan 06, 2009 11:25 am Reply with quote

I have tried running the bath hot tap when the shower is running and the shower stays cold.
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Rico99

from United Kingdom

Joined: 29 Feb 2008
Posts: 501
Location: Cheshire,
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PostPosted: Tue Jan 06, 2009 11:38 am Reply with quote

briwall1,

You not quite understanding what they are asking.

Turn the shower OFF, run JST the BAT hot tap. Does the water from the BATH HOT fluctuate in temp.

Rico
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briwall1

from United Kingdom

Joined: 05 Jan 2009
Posts: 6
Location: Herefordshire,
United Kingdom

PostPosted: Tue Jan 06, 2009 1:19 pm Reply with quote

Oh, sorry!
no the bath temperature doesnt fluctuate, it stays a constant temperature.
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