rapid increase in boiler pressure

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3 Apr 2021
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United Kingdom
Boiler is a Wocester 280, with an external expansion vessel fitted. One minute the boiler was working fine, the next minute when a demand is applied, (eg. hot water), the pressure shoots up from half a bar to over three in just a few seconds. Safety cut out trips and shuts of burner. Lots of unpleased knocks and bangs from boiler as pressure rapidly drops back down again. I know the expansion vessel regulates the pressure, but having had a vessel fail before, the speed of the pressure change is MUCH faster with this problem. I've tried draining and refilling the boiler in the hope of an air lock, but no change. Any ideas what the problem could be?
 
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+1 .... check pump ... no flow through the boiler = water overheat and expands creating rapid pressure rise + boiler shuts down being too hot. PRV bangs open to dump pressure as system is over pressurised.
 
Worcester 280??

Discontinued in 1997. 24 years ( at least) for a combi is phenomenal.

Start saving though
 
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Thanks for your help folks, you were correct, it was the pump that was the problem.
 

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