DIYnot.com > dhw

posidriver · Posted: Fri Nov 16, 2007 9:50 am Post Subject: dhw

i have recently fitted a new bathroom with a nice big corner bath, however i am not able to fill it as the combi boiler cuts out every 10 seconds and sends through a spell of cold before firing up again. does anybody have any thoughts on this problem? my c/b is a alpha 280 and i believe it could be the flow valve or dhw flow valve micro switch. any help would be appreciated. thanks

corgigazza · Posted: Fri Nov 16, 2007 6:18 pm Post Subject:

sounds like blocked domestic heat exchanger on the system water side, replace heat exchanger, then fit magnaclean on return fron rads.

bengasman · Posted: Fri Nov 16, 2007 7:22 pm Post Subject:

Sounds like the plate exchanger is blocked. Either have the system flushed and exchanger cleaned, or powerflush on its own may do the job.

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