Mixer Shower Problem

[erp]

I recently bought a property with a relatively new mixer shower. I've retained this and simply changed the exposed pipe and rose to concealed pipes behind the wall and a fixed arm. Now that i am in the property and actually using the shower i am finding that it starts really well, great pressure and temperature but after about 5 minutes the pressure drops to a dribble and comes back sporadically. I noticed this happened this morning when i tried to cool the temperature down a little. (although, i did do this after about 5 minutes so it may just have been coincidence)

Any ideas what the problem is? I asked a plumber yesterday but he wasn't sure. Any help would be greatly appreciated.

 

[Plumbstar Tom]

worth check filters etc are clear but how many times has this happened?

 

[erp]

We've only tried to use the shower 3 times, and it's happened each time.

When we ran the pipes and connected it to the fixed arm we tested it to ensure it was working before enclosing it with pboard and tiles. It ran fine but we didn't leave it running for a decent amount of time. It's really frustrating because it works perfectly at the start then eventually dies out.

 

[Plumbstar Tom]

What system is it on?

what make and model showwer is it?

 

[erp]

It's off our domestic hot and cold water system, hot water via a Combi boiler.

It's a Triton, i can't find the model number on their website, the main unit is very similar to this http://www.tritonshowers.co.uk/media/7912/unmebtcm_v2.png

 

[easylife]

if the shower works ok for 5 mins then it would seem to be fine are you sure there are no problems with the combi like the 3 way valve.

 

[stani]

Get someone to see if it's the boiler which is shutting off, may be a poor flow through the shower problem

 

[plumberpete]

It's off our domestic hot and cold water system, hot water via a Combi boiler.

does the cold come from a tank above? if so how high is the tank from the shower head.

 

[Best]

Thread is a year old!

 

[scotty plumber]

how has somebody picked up on a thread started such a long time ago? This has happened a couple of times today.