worcester 35CDi II boiler

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24 Sep 2011
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Please can anyone help me.

Having just replaced 2 radiators after draining the system, my boiler now seems to have an air lock in it.
I have bled all the radiators in the house and they are free from air.
Everytime I try to reset the boiler the pump runs and the gas ignites and after approx 30 seconds there is a judder within the boiler and it shuts down.

The manual supplied with the boiler, which I inherited when I purchased the property last year, has no trouble shooting information.
 
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Maybe the Auto air vent within the boiler isn't operating.
or
Do the heating pipes from the boiler go up into a roofspace, if so you may need to check air vents up there.

Does the boiler operate in hot water mode?
 
There's an auto aire vent on top of it. make sure the black dust cap is loose, if it is you may need a new one. It's inside the combustion chamber so you'd need an RGI
 

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