In message , Set Square
writes
In an earlier contribution to this discussion,
raden wrote:

In message , Neal
Harwood writes
I have a Potterton Profile 50e boiler, and lately the (thermal?)
cut-out has started tripping. This results in the pump going
continuously, but no hot water.
It happily resets manually, and starts up again.
It seems to trip 4/5 times a week, at different times/conditions - no
obvious pattern.

Any ideas?

The impeller of the pump hasn't broken off the shaft has it ?

I don't think the system would run for between 1/5 and 1/4 of a week if it
had!

You have a point there - I'll try to read threads better in future
--
geoff