My shower goes from hot to cold??

[Markholmes12]

Hi was wondering if anyone could help me I have a bristan mixer
Shower in my bathroom and when I turn it on it goes hot the after about a few minutes goes cold then goes hot again any thoughts
I have tried the sink and the water stays hot constant on that any ideas anyone thanks

 

[Charnwood]

New shower, old shower? What model Bristan shower?
New problem, just started or old problem, new house (new to you)?
Type of heating system?
Inside leg measurement?

 

[Markholmes12]

It's a new house to me just bought it they said they did the bathroom about 5 year ago but never mentioned the problem and since I have had the house 4month it's been doing it not sure on shower model and its just a combi boiler thanks

 

[Charnwood]

Post a picture of the shower. Might help.

 

[Servotech]

Have a look at the cold mains stop tap making sure it's fully open.

Might not be the fix this time but I've certainly come across a few situations were it as been.

servotech,

 

[Markholmes12]

Hi yeh the stop tap is on full I checked that but thanks

 

[Markholmes12]

Untitled

• Markholmes12
• 16 Jun 2013
• 1

that is the shower thanks

 

[texasholden]

I'd run a hot tap elsewhere in the bathroom. If it doesn't suffer similar fluctuations then I doubt it's your boiler.

More likely your thermo (blending) cartridge.

I reckon the blending cartridge has had it. It'll be a plastic thing behind the temperature control knob. They normally unscrew or pull out.

I used to sell this stuff and had to stop using Bristan - the worst service from a brassware manufacturer I have encountered. Equipment is basic (and not totally dreadful) but their design and customer service departments were dreadful (IMHO)

 

[Markholmes12]

I have turned the tap on hot while the shower was on and it made the shower go cold is that right ?

 

[Agile]

You have said nothing about your hot water source!

If a combi boiler then turn down the hot water temp know a little!

I find that Bristan have solid products and a very good customer service!

The bad one is Triton who make bad products and have bad customer service. I fitted a shower pump which worked for three days! They were not interested and that episode cost me £132 and three hours labour on a Saturday!

 

[Markholmes12]

If you read third post I said its a combi boiler look a little !!

 

[Tipper]

Some suggestions although you being shirty with those trying to help doesn't go down too well!

1 Clean your shwoer head or change it if in a hard water area.

2 Combi boilers are sensitive to flow and as such if too low will will turn on and off repeatedly. Getting the flow rate up will help.

 

[Agile]

That's particularly the case if the boiler is not serviced regularly.

Many of those problems are due to the shower head holes not being kept clean!

Running a hot basin tap at a half flow is likely to cure the problem on a bodge basis.

Tony

 

[onlyfitidealboilers]

If you read third post I said its a combi boiler look a little !!

Please don't be rude we are here to help its not as if your paying is it?

 

[Markholmes12]

Yeh sorry people my bad was having a crap day I appreciate the help
I actually just put the sink tap on half and the shower stayed hot any suggestions on the problem thanks ?