And guess what failed again this morning? Third time in a month 
It is one of those 'high tech' condensing ones isn't it...? 
yes
Failure one: the condenser mini tank filled with water because the gas engineer that serviced it in January didn't spot or clear it of the gunge that collects
Failure two: the flap valve on the air inlet split jamming the inlet fan (actually it still just about worked)
Failure three: the Hive (web enabled heating control) lost its RF connection to the boiler because the RF repeater it damn well shouldn't need for a few metres got accidentally switched off in all this fucking about with building work
What failure four will be I don't know but I guess I will soon