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Mend Ravenheat Pressure Rads Heating

Ravenheat RSF100ET with low pressure?

I have ravenheat RSF100ET which serves 11 rads over 3 floors with no problems. However during a heating cycle teh pressure on the gauge will increase from the 1 Bar red mark to around 2.5 bar. After it goes cold, you notice it drops below 1 Bar. It keeps getting rid of water through the over flow although the pressure doesn't go above 2.5 bar. Any ideas please?

Bipin
December 2010
RavenheatHeating, Home Heating SystemsPressure Rads Heating
It sounds like the diverter valve is faulty

raven
June 2011

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