In article ,
Bob Minchin wrote:
Dave Plowman (News) wrote:
Seems it's a manometer. Presumably to work the gauge which shows the
water pressure?

Possibly but as it goes to the PCB, it will measure the system pressure
and shut down the boiler if it falls below a prescribed limit.

If the pressure gauge is electronic, the same sensor might be used for
the display but otherwise a simple selef contained mechanical pressure
gauge is probably used for the display.

The term manometer is more associated with measuring gas pressures which
is not likely to be monitored by your boiler but also could be measuring
fan air pressure which will be monitored by the control system.

The new part arrived today and it's simply a 'mechanical' gauge connected
by a copper tube to the sensor. No electrical connection. Had it not been
winter, I'd have removed it first - and then tried a new O ring.

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*Why is the word abbreviation so long?

Dave Plowman London SW
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