Thank you Dan and especially Paul. I flushed the HE with water as Paul described. Not much debris came out and none of it was very chunky, so I was a bit apprehensive putting it back, but I should have had more faith - I have just had my first hot shower for about a week, so thank you very...
Thank you very much Paul. I had the flow valve apart to clean it and couldn't remember how some of the bits were oriented on the shaft. what you said about the chamfering pointed me in the right direction.
So that is back in place, but the underlying problem remains:
I recently got the...