vokera linea hw problem

[dunsdragon]

works fine in ch but in hw it only fires for a few seconds then stops.
sounds like its boiling the water but can't get rid of it.
heat creeps down the ch when this happens when boiler is in hw only mode.
Wondering if a new diaphram kit for the divertor would cure this, but the "kettling" noise?

 

[DP]

No diaphragm. You have a dirty system that needs to be cleaned.

 

[dunsdragon]

Theres no problem with the heating every rad is working fully its just the hot water.
Think i'll flush the heat exchanger first.

 

[45yearsagasman]

When you remove the plate exch clean it as best as you can and make sure the ports are clear.A system flush will not cure your fault as it is local to the boiler.You say the rads are heating ok,so main heat exch should be ok.There are several Lineas and you don't say what model you have.

 

[DP]

Theres no problem with the heating every rad is working fully its just the hot water.

This is true because the waterways are large compared to those in secondary HE

 

[nickso]

if its kettling its likely to be a choked primary too.