Bristan Sonique Thermostatic Cartridge service breakdown BRP120C
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- Опубликовано: 21 дек 2020
- This is a current (2020) Bristan Mini Shower Mixer Cartridge. No. BRP120C
Since I was figuring out how to disassemble and reassemble this for myself I made a video to remind me how I did it. So I thought I might as well put it up on the web. 
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I had lost hot water in the shower. Removed the cartridge and followed this. Cleaned it up and greased it, it’s now running perfect. The plumber wanted to fit a new shower. Thank you.
Thanks for posting your comment, I am very happy that my video helped.
Really useful video, clear and precise. thanks.
You are most welcome
How do you adjust the shower temperature on the Bristan Sonique thermostatic valve. In the fully opened nine o'clock handle position, the water is still not as hot as I would like? Paul
I don't know what temperature your hot water is but mine is at least 55C and to be honest after reassembling the unit and putting it back it worked fine. Turning the lever back to about 11 o'clock gives a suitable shower temp. I rewatched my video and at 1minute 20 seconds in you see me unscrewing the temperature control valve with a 2.5 mm allen key, screwing that in or out may help. The unit does have a thermostatic valve in it as well. You can see that in its cradle right at the beginning, if that has a fault it may be the cause. That's about the best I can do as I haven't had to solve that particular problem.
Thanks for this very helpful post Peter, I have a Bristan Mini Twinline shower and the thermostatic valve looks almost identical to yours.
However I have a rather strange anomaly with mine, which servicing has not cured.
The shower has a Grundfos 2 bar pump fitted to it which I have also stripped and serviced, but in spite of this I continue to get reduced pressure on the however side only.
In fact the hot has about half the pressure of the cold.
I don't think I have air locks and have cleaned both in line filters at the pump and the shower.
I wondered if you have ever encountered similar before.
Any ideas or pointers would be much appreciated.
Cheers Mitch.
Sorry Mitch I don't know the answer to this. My system is supplied by mains pressure and just seems to work, hot and cold seem reasonably balanced. You need someone who has worked with a lot more plumbing systems than I have.
@@peterwarne1508 Thanks anyway Peter.
Hi, thanks for the video. I've had a Sonique installed recently, I tried adjusting the temp on it but it won't get hotter than the factory preset and now it won't even go back to the way it was. Bristan have sent me a replacement thermostat and piston assembly (Part No: SK1500-3), but I don't know how to replace it. Do I just use a 30mm socket to remove the whole cartridge from the body of the mixer and the piston is loose inside, or do I have to disassemble the cartridge to get to it?
Sounds like you will need to take the cartridge out. Have a look at Bristan's own video on a slightly more complicated shower mixer here: ruclips.net/video/wq2fHRhgFqo/видео.html The Sonique is easier, you will need to pop off the grub screw cover on the front handle/cover and with a 2.5mm Allen Key undo that grub screw, then pull the handle/cover off. You will need to unscrew the cartridge assembly with a 30mm socket wrench/box spanner. Then you will be looking at the part as in my video. I recommend greasing the O rings and any threads you can see as it makes the whole thing much smoother in operation. Also play with the angle of the handle of the temperature control/front cover when you push it back on, as that can also influence how the valve works. (You don't need to fasten it with the grub screw until you are happy with it. You may find that the off position is not quite at 6 o'clock.)
@@peterwarne1508 Thanks. It was indeed a simple job, maybe 5 mins to remove the cartridge and swap out the thermostat/piston. Trickiest part was getting the spring that goes into the back of the piston to stay in position when putting the cartridge back in. I adjusted the temp screw so that the outer edge of the cup was flush with the edges of the cartridge and I seem to have got the desired temp luckily. The old thermostat (2 weeks old) was stuck in the cold position (rod fully in), stuck it in a pot of boiled water and with a little help it popped out.
I get what you mean with the handle being off position. I will have to adjust that as the valve shuts off before it reaches the 6 o'clock position.
Thanks again.
@@EE-Z I'm glad it worked out well in the end
I should have added that the spring can be slightly stretched at on end with pliers so it sits in the fitting on the wall so the cartridge and thermostat can be positioned more easily before screwing back in.
@@peterwarne1508 yeah I did see that recommendation in another video, but I assumed that might be for a well used product rather a new one like mine, so I didn't bother grabbing a tool that could do it , I just thought the spring would stay in there by itself. Thankfully it wasn't that bad and got there after a few attempts.
How do you know how far to screw the temperature control spindle back in?
By feel as I recall. I just screwed it in until it 'felt right'. It probably isn't too critical because when the hot and cold supplies are connected there is a lot of latitude on the flow/temperature control. For me the temperature of the shower water is at about right at 11o'clock. With the hot full on it is at 9 o'clock but that's too hot for me with my hot water supply.
I don't recommend you split the valvle body like that.
All I can say is that it worked for me.
@@peterwarne1508 if it's tight the brass is very soft and will split.
Hard water areas old old valves will ot come apart so easily.
I agree you have to be careful with brass. Soaking the whole part in vinegar can help.