Have had the plumber who installed shower back, as 2 yr guarantee is up in couple of weeks, he said there is a chamber on the side of the pump that must have 1 bar pressure in it and it was all gone. Dont ask me what this means, he said it was like a football going soft. Anyway he used a pump to put it back in again and said it should be fine. All seemed well, had a shower the next day and it was fine. Used it again today and it was going fine for a good while then just stopped for maybe 10 seconds and started again. Nearly scalded me though as it was roasting when it started up again. Does this explanation for what was wrong with it sound right and it the pressure is back in there now, why did it stop again, I know it was only briefly but still I want to be sure it is okay especially since guarantee up shortly. Would appreciate any info.