Episode 4...Managed to sweet talk a guest into sorting it out,sort of.We dismantled all the end hoses and then blanked each one of separately to see if there was a restriction.That didn't seem to provide any answers nor cures,checked the diaphram,then decided to do that most heinius of crimes,read the instruction book.Absolutely clueless,so in a final act of desperation he pressed the reset button. BINGO.