hot water prob All aspects of plumbing questions and answers, help, tips and information

[bdh]

have problem with my hot water on my combi boiler.
the water heats then runs cold then heats up again.
any help grateful cheers

[htg engineer]

Could be a few things - if you don't want get an engineer - i'd suggest replacing the HW sensor first - as it is the easiest and cheapest to change.

[bdh]

[quote="htg engineer"]Could be a few things - if you don't want get an engineer - i'd suggest replacing the HW sensor first - as it is the easiest and cheapest to change.[/quote]

is this the thermister?
and are they standard sizes or would i need
to speak to boiler manufactuer to find a local
supplier?