Its crazy ermi i always explain (when ive fitted an ideal) to the customers in laymen terms what all the functions on the screen ment as they were coming up, fan post purge , ignition, pump overrun , and after a couple days they phone thinking theres something wrong with the boiler because these functions are coming up on boiler, when your explaining the workings of the boiler i think it can be overwhelming for soon customers and they struggle to talk it all in at first but so do we its all about learning something new