Thermostatic shower mixer..faulty

[Diyisfun]

Going to friends for a few days for new year, just been told shower not working properly.
I have been told it keeps going cold, (the hot water is ok, combi boiler).
I dont know what make of mixer valve it is, it is large, white, has a lever to turn on/off (controls flow).
Are these things repairable?
Any advice appreciated as I would like to fix replace, hate cold showers.

 

[PrenticeBoyofDerry]

It would be best if you knew the model of the shower there could be a number of reasons why this is happening. Has there ever been any high pressure issues on the system?
Do you know if it is a fault since being installed or if the shower was working correctly and the fault has just occurred.
There is a link here to a Triton mixer valve installation manual, it may help if it has not been set right on installation there is also has a troubleshoot section.
http://www.tritonshowers.co.uk/media/12978/elina exposed concentric tmv2 thermosatic.pdf

 

[Diyisfun]

I think it a Mira, Its about 10years old, has been working ok.
Have been having a read, looks like it could be £100 for a part, may be at that age get a new one.
I suppose its about trying to get something that will line up with the pipework as the pipework is all in the wall.

 

[HERTS P&D]

Find out what make and model it is and find a replaceable unit which would fit onto the same foot print from their website.

Andy

 

[picasso]

check the boiler isint cycling on and off with just the shower running.

 

[Diyisfun]

It would be best if you knew the model of the shower there could be a number of reasons why this is happening. Has there ever been any high pressure issues on the system?
Do you know if it is a fault since being installed or if the shower was working correctly and the fault has just occurred.
There is a link here to a Triton mixer valve installation manual, it may help if it has not been set right on installation there is also has a troubleshoot section.
http://www.tritonshowers.co.uk/media/12978/elina exposed concentric tmv2 thermosatic.pdf[/QUOTE]
It is a triton, dont know model

 

[Diyisfun]

To replace the whole unit, I am guess that a good plumber could do it in about 30 mins, is that about right.
If that is the case I think it might be easier for my friends to have a new unit rather than much about getting a spare part fitted, Im thing cost wise.