Morphy richards jet steam iron. Dirty water coming from under the plate. Its not the cartridge. Iron is about 5 years old. Can I take the plate off to clean ??

There is a bad seal on the water reservoir or the steam tank inside the iron.

https://www.hotukdeals.com/discussions/descale-light-on-morphy-richards-43330-power-steam-elite-2626695

https://www.amazon.co.uk/ask/questions/asin/B006JX4VN4

https://www.mumsnet.com/Talk/housekeeping/741113-Steam-generator-iron-problems

https://www.morphyrichards.co.uk/Pdf/IB42242.pdf

It may be calcified or have lime scale. If the heater is "gummed up", it cannot heat properly. Try using either vinegar (takes longer) or an iron cleaner. You pour it in and it breaks up the scale. CLR works quite well too. Use pipe cleaners to clear out the holes in the sole plate.

Soak and/or run vinegar or CLR through it. They also make a steam iron cleaner.

very poor pressure of steam coming to iron

My MORPHY RICHARDS 42256 JET STREAM STEAM GENERATOR IRON has stop producing steam. I have changed the filter and although it heats up, it does not produce any steam.

Try cleaning the inside of the water holder it might just be calcium built up, use white vinegar to clear it and you'll prolly be fine. Put vinegar where you usually put the water and heat the iron up and steam the vinegar through the iron then put water, try distilled water to save this problem from happening again or try filtered water.

You can download the manual at
http://www.morphyrichards.co.uk/Downloads/InstructionBooklets/IB42271.PDF

We have a water filter and softened water. Our iron is clean and went after 2 months.
A Morphy Richards Jet Stream Elite pro.
It is just the steam generator that has gone.