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Cheers - missed that in the post above. Will degunge the tank and start again. Jaz

Thanks for your suggestions and help so far. An update - the (external) pump now seems to be running sweet and is pumping very hot water. However, the boiling dry ('kettling?') problem continues and the rads are not getting hot. They've all been bled to within an inch of their lives but...

Water seems to come out forcefully from every bleeding radiator :) When playing with the pump I did notice that when closing out the isolating valve the stuff that trickled through was filfthy - like 100,000 mile old engine oil. And there's no such thing as 'just' a householder :)

Ah ha! This might help then... The system only has an external pump, some french effort that escapes me now. The boiler is a Saunier Duval Xeon, apparently a current product (?!?!). The pump I'm guessing can just be replaced for 50 quid parts or maybe 150 fitted, so I reckon that's my best...

Hmm. Had a look at the pump last night and it had indeed seized. Some manual intervention caused it to run again which did the job for a couple of hours or so, but the problem has returned (boiler sounding like it's 'boiling dry') - only now I get a similar sound from the rads - a gurgling...

Cheers for the prompt response. Had isolated the pump as the next area of attention! You're quite right about engineers staying away - have found it a real struggle in the past (hence my 'keeping it going' efforts to date)! Ta Jaz

Hi guys, Long time lurker, first time poster. I have a manky old Sauiner Duval boiler (non combi) running an open system - old skool, inherited in old house. Has always worked OK (if seemingly inefficiently) but a problem that I've come back to yesterday leaves me scratching my head...