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The 05 code has gone away. I'd been resetting the thermostat everytime as a matter of course but it wasn't until I scrolled through the faults that it's really failing with 04. Definitely get a spark but intermittently not igniting. I cleaned out the combustion chamber yesterday and it is...

Getting a spark but gas doesn't ignite. Then get a fault code 04. If I turn the boiler off at the main and back on I can then get the thing to ignite. It's as though the gas is getting through and it's sparking but either the gas or the spark isn't enough. Any ideas?

Hi my Xtrafast is overheating with fault code 05. The Overheat safety thermostat has to be manually reset to make the boiler operate again. This is intermittent. Any ideas what this could be?