in a previous posting i had a fault of not being able to turn c/h off,
i have changed flow switch and micro switch but still have same problem,
flow switch seems to operate ok when tap is turned on or off
anyone got any more ideas
can anyone help
we have got a puma 80 about 5 years old c/h comes on by itself but cannot be turned off by timer or switch,hot water is fine,red light comes on
when tap is running.only way to turn c/h off is to put boiler on stand by.