Potterton Powermax HE - A01 fault

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I'm having a ignition fault on my Powermax HE boiler with error code A01.

There is no 'visible' spark being generated on the ionisation probes (tested on new and existing probes - 3 different units, all gapped at 3mm so the fault isn't here). However the output from the PCB is registering 180v DC for 3 seconds or so (tries this cycle 5 times before cutting out)

I also have a spark tester LED unit and it shows there is a high voltage coming from the spark generator.

Obviously either the spark generator or the PCB is faulty as one or the other isn't generating sufficient current/voltage to create a visible spark... Question is, what tests can I do to establish which unit is at fault?

I don't want to play roulette y'see as spark generator is £100 and the PCB is £200-£500 quid... I'd like to take the scientific approach... Thanks!
 
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Sorry but site rules prohibitus from giving advice on gas work, you will need to get a Pro in, or go for a Baxi fixed price repair
 
Sorry I don't mean to sound pedantic but this is an electronic issue rather than a 'gas' issue... I'm not opening any sealed areas where there is a chance of gas leakage. I just want to swap an electronic component
what were the results of the 26.9 checks after you worked on the appliance ?
 
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