MiraExcel B Cartridge
My shower heat has started to reduce. This has been in place for over 6 years now and has worked fine, it is fed from a combi boiler.
The boiler is heating the water up as normal is this due to the cartridge being faulty ?
Regarding the temperaturefluctuation or cool running it could be a faulty cartridge however to checkthis, see if you can get hold of the hot supply pipe before it enters theshower or perhaps as it leaves the boiler.
If when holding this pipe thetemperature fluctuates or goes cool then the problem is not with the shower butmore likely with the boiler as the shower can only deliver what the boilersends to it.
Disregard the temperature at thetaps as they have a different flow rate.
If the above is Ok then it's best just to replace thecartridge, however it is probably worth stripping the cartridge out andchecking that the inlet filters are clean, before buying a new cartridge.
To replace the cartridge
Turn off hot and cold water supply
Pull front temperature knob off The rest of the knob assy.just unclips
Remove 4 screws that hold cartridge into body
Pull old cartridge forward shouldn't be too tight
Set new cartridge for High/Low pressure (instructionswith cartridge)
Slip new cartridge into place remember to check that the newseals are all in place (and don't drop out as you push back)
Tighten screws be careful not to over tighten
Refit knobs.
Turn on water and test. (Occasionally you will have to resetthe cartridge temperature, instructions with cartridge)
Easy peasy!!!!
Cartridge Mira903.33 This cartridge supersedes theprevious high and low pressure versions
Link to cartridge
Answered 11 years ago by The Shower Doctor
View Spares and Order Parts:
Mira Excel B - post 2003 Shower Spares
Do you need any additional help to find the correct spare part?
Please click the following link if you would like to see other answers or ask a question regarding the Mira Excel B - post 2003 - Shower Spares
If you've landed here and this question is not about your specific product, please take a look at these similar items on our Mira Concealed Shower Valves Spares page. Alternatively, if you're looking for any other brands you should view our full range of Shower Spares.
If you do not want to proceed with a repair or you want to buy this item or similar, please consider one of our Replacement Mira Concealed Shower Valves
For any other support request please get in touch.