Hi All,

I have had a Baxi 105e instant Combi boiler for over a year now.
It has developed a whining noise. This was only really noticable when
the heating was running. It would whine every so often for a few
minutes then stop.

It now does it when only the hw circuit is switched on. The 105e
instant has a small hw tank built in. I think the whining happens when
this is being re-heated or filled up. If i turn a hw tap on when the
boiler is whining then the noise stops.

The boiler still fires correctly and the heating and hw circuits are
working ok.

There was a small leak in the heating circuit last year that took the
pressure to about 0.5bar which may have caused some damage.

I initially thought it was the pump but as this is running when I am
drawing from a hw tap and there is no noise. But are there any other
parts on a boilder that would move for 1-2 minutes at a time that
could create this noise?
There are only diverter valves but these would only move between
heating and hw for a few seconds.

I don't really want to get anyone in at this stage until I know mopre
about the cause.

Does anyone have any ideas?

Regards,

Reader