Ariston Micro Genus Boiler 24 MFFI. Getting fault R03 but it wont reset. Replaced safety theromostat and still same fault.

The information I have found states it is a problem with the pressure switch. A faulty pressure switch will prevent ignition from occurring. Here is a Youtube video link showing the issue. Reading the comments below may assist you in isolating your problem. Hope this helps!


Ariston microGENUS 24 HE MFFI Error 34

the A01 fault code is nearly always down to the pcb, 99% of the time in fact, its a common fault, but not common enough for ariston to be responsible for boilers out of the warantee. you can normaly check this yourself, while the tap is running check if the electrodes are still sparking even after the gas had lit, this means the pcb is not detecting the flame and trying to relight. eventualy it will lock out with a A01 code, if u reset it might work for a short time but eventualy u will get to the stage where it will no longer resart.

if your handy you can replace the pcb yourself, there is someone selling them on ebay for £85 thats a steel, its half the trade price never mind retail

e codes mean you need a tech to fix this e33 is presure switch stuck open cannot find e32

when was it last serviced?dirt may be a factor,there are many parts that cause this fault in the microgenus so you need someone familer with the product parts playing up could be1.airswitch2motor3flowgroup4ntc you havent mentioned if it needs re-setting

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

The plumbers repair should be guaranteed, give him a call back.
It sounds to me that the pilot flame needs to be adjusted or the thermocouple is not aligned properly or there is a draft that is blowing out the pilot.
Good luck...

heres a copy of the serviceing manuel for the unit. just click on the link and download the manual. http://www.ariston.co.uk/uploads/doc482c2cada6e71.pdf good luck

turn both valves off at each side of radiator and once the pressure balances it will stop leaking, there is no solution to this whilst using this as a radiator to heat the space, but will stop the leak.

what part is leaking ?what type of set up do you have? steam or water
make sure you completely drained and refill the system before use. your water level needs to be corrected or this will force water up the lines instead of steam
your radiators need to be pitched so that the steam (water) can return back when the system shuts off
as for the leak. where it is or what part is leaking
heres a manual for your system
http://www.ariston.co.uk/uploads/doc4947b0d538f79.pdf

hope this helps