In message , John
writes
I have a Glow worm 30cxi and it keeps cutting out, the fault has been going on
for some time, but we can usually restart it by switching it off, leaving it
for a few minutes and switching back on. However it is now not responding to
this!
Is the fault common to this boiler, what are the likely causes and finally how
much am I likely to be looking at for its repair?
Thanks

Do you live in a hard water area?

The heat exchanger might be getting furred up and overheating because of
the reduced flow

or several other reasons

--
geoff