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is this a common fault, ariston microgenus 2, pcb flame rectification probl?

flame rectification fault on ariston microgenus 2 combi gas boilers, approx 2 yrs old, requiring new p.c.b. ie, presence of flame not recognised, continues to spark, and locks out, requiring replacing of circuit board. ariston technical say its not a known fault, but this is my fourth such instance and i have two further boilers doing the same thing. tried drying out the pcb, checked earthing ok, electrodes clean / ok.

installer, southern ireland
October 2010
AristonHeating, Home Heating SystemsFault Ariston Combi
Yes this is a common fault with pcb, i am constantly repairing these pcb for engineers.

Dave
October 2010

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Mend repair fix Ariston home heating systems