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Mend Ariston Microgenus Boiler Heating Fault Code

ariston micrgenus?

I have a boiler with the fault code 'A-O'. Anybody any idea what the code stands for

gerard
March 2009
AristonAriston MicrogenusHeating, Home Heating SystemsBoiler Heating Fault Code

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Ariston Microgenus A-O Fault Code - Help