I have a good performing Baxi Barcelona ... but today had to change the ignition board for 2nd time .... luckily under warranty.
Are Baxi's particularly unreliable for circuit boards or am I just unlucky, I asked the service guy who did the warranty and he was adamant that they fail no more than any other make.
I will say that their installation manual has good diagnostics in it ... flow charts correctly identified failed boards quickly on both occasions.
Rick