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I have an ariston 20/24 mffi combi pressure rises when switched to central heating but pressure ok when asking for hot water ? expansion vessel ?

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Over heat limit stat on central heating circuit ? if hot water is ok and hot to temp when run for 5 minutes the expansion vessel is doing its job.remember hot water is the maximum demand for any boiler ,,heating is secondry?once you establish hot water at maximum rate then the only real problem is on you demand for heating??

Posted on Dec 12, 2012

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Posted on Jan 02, 2017

mrhotandcold
  • 248 Answers

SOURCE: worcester oil heatslave boiler pressure rises to over 3 bar when

iif you,ve tried everythng change gauge

Posted on Oct 12, 2009

  • 44 Answers

SOURCE: heating, but no hot water on a vaillant turbomax 28 combi

the problem is the diverter valve unit, source a corgi engineer to fit new one, cost for valve approx 80 quid +fitting

Kindly

Richie

Posted on Dec 16, 2008

  • 1 Answer

SOURCE: gas central heating boiler. insuffient water pressure.

u need to have a key (its like a T shape key) and u put that under the boiler its a hole in there, than u open the tap which is near this hole.

Posted on Oct 31, 2008

  • 17 Answers

SOURCE: Ariston Combi euro boiler SX20 MFFICE 970903039 GC No 4711602

have you tried to put some cleaner into the system it siounds like you may have a circulation problem

Posted on Nov 27, 2008

  • 659 Answers

SOURCE: Ariston ACO MFFI 35 E34 fault code present

This is the manual for your boiler. I hope the information contained in the manual will help you identify your problem.

http://www.ariston.co.uk/uploads/doc47e92b04013d8.pdf

Posted on Apr 02, 2009

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Why does the pressure rise to over 3bar when the central heating is in operation ?


3 Bar = 43.5 PSI When you heat water it always expands increasing pressure.
In a closed vessel volume can increase by 2-3%. Either expansion tanks allow for this and PSI is maintain or without an expansion outlet the PSI will increase in proportion to heat supplied.
Is this a low temp hydronic boiler operating at or <140F, a hi temp hydronic boiler @ >180F or steam boiler?

Oct 18, 2014 | Water Heaters

1 Answer

Hi my vaillant combi gives hot water for only 15 seconds then runs cold turn the tap off, run the water again & gets hot then runs cold some told me it might be the diverter valve can any body help...


yes it is your expansion vessel it sounds under charged to me?your expansion vessel needs to be recharged to 1 bar at least,but check manufacturers instructions it could state different.if the heating is fine and your getting hot water in intervals your diverta valve is moving and working?

Dec 11, 2012 | Water Heaters

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Replaced diverter valve on worcester 9.24 combi and still only luke warm water


check your expansion vessel is not flat.if so recharge..simple way to check press in valve on vessel if water comes out or little air recharge..if water still in vessel the diaphram in vessel has split so replace vessel?hot water relys on expansion??

Dec 10, 2012 | Water Heaters

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I have a worcester 28cdi combi boiler. The pressure keeps going up yo 3 bar when the heating is on, and venting of via the pressure valve. When the boiler cools down the pressure drops to zero, and I have...


Your boiler has an expansion vessel that is like a bladder full of air. Yours has lost it's air pressure. Check your manual for this vessel and where the valve is to re-inflate it and what pressure to inflate to. It should have a simple tyre valve, pump it back up (usually to about 1 bar after releasing the water pressure) and should be all fixed. If you can't re-inflate the bladder is holed and the expansion vessel will need replacing.

Dec 05, 2010 | Water Heaters

1 Answer

Ariston ACO MFFI 35 E34 fault code present


This is the manual for your boiler. I hope the information contained in the manual will help you identify your problem.

http://www.ariston.co.uk/uploads/doc47e92b04013d8.pdf

Mar 30, 2009 | Water Heaters

1 Answer

Ariston Combi euro boiler SX20 MFFICE 970903039 GC No 4711602


have you tried to put some cleaner into the system it siounds like you may have a circulation problem

Nov 27, 2008 | Water Heaters

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