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Ariston Microgenus 27mffi combi boiler

My boiler has an intermittent fault. The hot water and heating just stops working for no apparent reason then after either a few hours or days it starts again. I've contacted an engineer but by the time they can come to look for the fault, the boiler is working again and they said if it's working they wouldn't be able to find the fault! I've contacted Ariston but they told me to call out an engineer. I'm getting very frustrated with this. There are no warning lights when the fault happens and I've looked through the manual to try and get some idea. Do you think it could be the pump getting stuck or do you have any other ideas? Thank you for your help.

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  • loaff Feb 10, 2009

    I have an Ariston Microgenus 27 mffi combi boiler with the intermittent problem mentioned by others.
    16 months ago I had a new pcb, 2 new thermistors and a new air pressure switch fitted ( in fact 3 pcbs as 2 failed immediately ! ).
    Fine until a month ago when the intermittent working/not working started again, sometimes heating, sometimes water, sometimes neither and sometimes both.
    I asked a different Corgi plumber to check. He contacted Ariston's tech depatment who told him to replace the pcb, thermistors and air pressure switch.
    Surely new replacement parts should last longer than 16 months ! However, Ariston churned out the mantra that their product has a 2 year guarantee. I argued that all the replaced parts were their products.
    Isn't thei a legal answer to this clearly flawed product ?
    Clearly their is


  • punjabimu670 Apr 15, 2009

    my boiler show chek flow failed

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Im an engineer and recently had exactly the same thing with this ariston boiler, i found out it was the the 'air pressure switch', this is a switch which is part of the ignition, it works in conjuction with the fan. when the boiler fires up the air pressure switch makes, if its faulty it can break the circuit mid flow and cause the burner to shut down therefore giving intermittent hot water and heating, theres a possibility that the aps tubes may be damaged as well so ensure they'e condition is good. hope this helps you

Posted on Sep 18, 2008

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