Glow Worm Flexicom 24CX cutting off at 41- 43 degrees.

[Philip W]

Last week while in the shower our water went cold so after some investigation we found the boiler was heating the water to 41 degrees then stopping and the temp would drop off. We put it down to the thermostatic valve cartridge in our Bathstore mixer tap after looking around the web but this morning the same thing has happened while doing the dishes in the kitchen. The water was hot but when the temp got to 43 degrees it stops heating up and drops till cold. There are no F code warnings and the water doesnt get hot again unless you turn off the tap and repeat the process.

Any ideas? Ive had a look in the manual which is very basic and doesnt mention anything like this...

Phil

 

[bspareltd]

Hex scaled

 

[Philip W]

Hex scaled

CAn i point out i have no experience or knowledge with boilers/plumbing. What does that mean? At a guess does it mean Heat Exchange is scaled?
Thanks Phil