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Mend Ravenheat CSI 85 A(T) Boiler Heating Pressure

Ravenheat CSI 85 A(T)?

When heating comes on water pressure switch goes over 4 bar then starts dropping as quick as it went up any explanations

danzon
April 2010
RavenheatRavenheat CSI 85 A(T)Heating, Home Heating SystemsBoiler Heating Pressure
Check filling loop has not been left open. Pressure drops due to a safety valve know as the Pressure Relife valve letting go, this is design to let go at 3.5bar of pressure.
Fault may be with a blockage in heating, do radiators get hot? if not CH blocked
If rads do heat up then your looking at the expansion vessel.

Chris
May 2010

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