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Ferroli Optimax HE31c a26 problem?

I'm having A pressure issue. The system pressure will increase to over 2-3bar and shut off from a starting position of 1.2bar. If I start from a position of a half a bar then I can only set my temperature to around 50 degrees for the system to stay under 2bar and remain on????

Ron McDowell
December 2017
Your expansion vessel may need looking at. It could be th emembrane has failed or that it may just need properly repressurising with air.

Search fopr testing gas boiler expansion vessel.

Your own boiler may be a little different but there is probably an expansion vessel inside the casing with a Schrader (bicycle style) valve. If you take off the dust cap and use a pen or small screwdriver to press the centre and release a tiny bit of pressure, only air should come out. If water comes out, the membrane inside has failed and the vessel will need replacing.

If OK, you MAY be able to repressurise with a bike pump. Yyou may have to drain a pint of water or so first, pump the vessel then prepressurise the system. Read the installation instructions. I fin doubt ask a central heating engineer.

Dunno how expensive a new vessel is fo ryour boiler or how much of a pain it would be to replace. Some people just fit a new external one

ddfbh
December 2017

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