Potterton Puma 80e hot water not constant, flow changing.

[TangoCharlie]

Ive had this issue for nearly a year now. I have replaced the flow switch (just the micro-switch)before as once the hot water tap was switched off, the led on the main board never went out and the boiler over-boiled, rattled and switched off every time.

I have adjusted the switch but if I adjust it slightly more it over-boils again. If I adjust it the other way, it fails to provide hot water.

As I mentioned, Ive replaced the switch (was an easy job) but do you think it needs the main flow switch replacing? Would that provide constant hot water at a constant temperature?
If so, is it an easy job?

many thanks,
Tc

 

[Agile]

It sounds as if the diaphragm unit is faulty.

But like everything in the world there are several possible causes of the problem!

No problem for me but for you?

Tony

 

[ChrisR]

If the pin in the flow switch isn't moving cleanly, several mm, the fs is faulty.