Worcester Bosch Greenstar 34CDi - Flame but no Heat

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Hi all, got an odd issue developed with a Bosch 34CDi Greenstar


When switched on, the display shows "7" for the start temp

There is the usual pause, and I can also hear a soft 'click-click' sound repeating every few seconds (I don't recall this sound previously)

The boiler flame then appears to light (green indicator on) and you can hear the system whirring into life.

The temp display then steadily increases, by approx 1 degree per second, up to about 45 (the main temp control is on "2")

The rise in temp on the display is much quicker than it used to be (when heat was actually being pumped out previously).

I can hear the pump running, but there is no heat being pumped out into the system.

The boiler light then goes off, and the temp drops back down (to about 17 I think)

The process then repeats.


The boiler doesn't get used very much, so wondering if this has anything to do with it.

There are no error codes displayed.


Can anyone please advise what the problem might be?
 
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Pump seized is a possibility, sounds like there is no circulation.
 

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