I had a techflow T3 pump fitted in June 2005 as the previous one started to leak.I have an intermittent problem - the pump stays on every so often and has to be turned off at the power switch. I can have a few months with no problems then after I have had a shower I can hear the pump is still on - I switch it off and on again and it still stays on - so I leave it off for the day.Then it will work correctly for a couple of days and then it starts staying on again. There seems to be no pattern to the problem. Can anyone help?