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combi boiler works but water is barely warm
QUESTION:We've recently moved into a house with an old Saunier Duval Combi
boiler. It kicks in fine when the hot water tap is turned, and
delivers a short blast (maybe 10s) of very hot water, but then the
delivered water cools to just barely warm, even though the boiler is
still merrily burning away. This effect is much more noticeable from
the upstairs taps and shower in the bathroom, than in the kitchen
downstairs, where the boiler is.
The pressure guage on the combi is currently at <1Bar, but this could
be raised. At the moment the central heating is not running (we still
have some radiators off the wall after damp course work), so the
boiler pump does not operate.
Can anyone explain what might be happening?
ANSWER: The boiler pump should run, when you require hot water. The pump should pump
central heating water around the boiler which then heats your hot water.
Unless you have disconnected the pump yourself?
Do any of the central heating pipes (i.e. coming directly out of the boiler)
get warm when you open a tap? Perhaps your three way diverter valve is not
working correctly.
Are you sure the flame does not cut out? Perhaps you're hearing the pump
running and mistaking it for a firing sound. Look, listen, for flue gas
outside.
If the flame is cutting out, does the boiler make a loud noise before hand
(like a kettle boiling)? Maybe your heat exchanger is scaled up, causing the
water to overheat, and cutting out the flame.
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