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Mend Saunier Duval SD 620 Combi Boiler Pressure

Very High Pressure (on a Saunier Duval SD 620)?

I am getting very high pressure readings on the above combi boiler. the pressure or water when cold is 1bar and usually sits around 2 when fully hot. Recently its jumping up to 4 bar !! and can only be reduced by lowering the temp...
Any Ideas. Thanks

Martin
January 2010
Saunier DuvalSaunier Duval SD 620Heating, Home Heating SystemsSaunier Duval Combi Boiler Boiler Pressure
Hi Ian - thanks a million, I'll pump that up when it's cold.I take it I can do that without having to drain down the system? Once I have it up to 1 bar with air, do I bleed the air from the expansion vessel or leave it ?

Martin
January 2010
your expansion vessel needs to be re-pressurised.

Ian
January 2010

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