This question is regarding Bristan Manual Cartridge CART-06700COMPL - CART06700COMPL

Shower valve question

Hi, I have a Bristan Colonial exposed shower mixer unit, with both hot and cold fed by a pump. After a few minutes at a normal temperature, it suddenly runs cold, then very hot, and ultimately settles back to normal. I've checked the flows coming in and they seem fine and equally balanced. Could it be a problem with the thermostat inside the unit, or the cartridge? If so, could you tell me where I could purchase another? Very many thanks.
Asked 7 years ago by Michael
You are correct my best guess is also the thermostat.

However can you get a hold of the pipes at the pump when it is doing the hot and cold thing if the pipes at the pump are going hot and cold then it suggests that the fault is not with the shower as the shower can only deliver what is sent to it.

Answered 7 years ago by Anonymous

Hi George,

Thanks a lot. I think I should start with replacing the thermostat. Can you supply one for this model?

The thing only runs cold for (say) 10 seconds, quite suddenly, so the pipe feeding the hot intake is still hot.

One small thing, though: when it goes cold, the pump seems to be straining to get a hot supply (bubbling sounds etc) but when I immediately switch the tap to full-hot, the hot runs fine. Hmmmm, puzzling!

Many thanks again!

Michael

Answered 7 years ago by Michael Stewat

With the Sirrus cartridges, in almost every occasion the first thing to do is give them a strip down clean and lube and fit a service kit, this will cure 85% of any problems and it is also the cheapest thing to do.

If after servicing you find out that it needs a thermostat or piston, nothing is really lost because it almost certainly needed a service in any case.

www.showerdoc.com/bristan-colonial-single-sequential-thermostatic-shower-and-adjustable-riser-chrome-plated-shower-spares

These are the parts for this shower.

Answered 7 years ago by Anonymous

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