hot & cold running water - temp sensor?

[jhanlon]

I have a Boiler Mate 2000 (installed 2003, new build) and it's not working properly - I noticed with the shower first, the water goes hot and cold whatever setting you start from and it's getting worse. The bath taps are also affected so I think it might be the BoilerMate's hot water temperature sensor. Can anyone confirm this?

Also, the toilet makes a strange screaming noise when you flush which I think may be to do with limescale, but I can't get the lid off to check/descale because I can't unscrew the flush
mechanism!

My wife has already booked a plumber to attend but I'd like some background knowledge for when he comes! (what's the best way to check his creds BTW?) Any help would be very useful. Thanks!

 

[Puddle]

it sounds as though maybe sensor,probable or pump sticking/stuck,you are right to get someone in for these units
the ball valve will probably just be the high pressure on the old washer

imho

 

[jhanlon]

thanks for this puddle, plumber on the case now