"Crewood" wrote in message
oups.com...
A few months ago I posted because one or two radiators on my systems
never got warm, many helpful replies told me how to get the system
balanced and this cured the problem.

Now it's happened again but this time most of the radiators are cold
but the hot water from the taps is almost boiling. It's normally the
other way round. The pump is very hot to the touch as well.

I have a solid fuel Parkray Chiltern fire and boiler unit, could the
system need balancing again or is it possibly something else this time.

Any help would be most welcome as it's turning very cold.

CC

Is the pump spinning?
Sometimes they stick after the summer idle period and the heat comes from
the electric power being dissipated in the windings that would normally be
taken away by the flowing water. Is the inlet pipe hot all the way back to
the boiler?
If it's not spinning you may (depending on the design) be able to switch of
the power and close the isolator valves, unscrew the bleed screw that should
be at the top of the pumping chamber, insert a small screwdriver and wiggle
it to turn the rotor.
Then turn on the power and see if it spins.
Once it's away that'll probably cure the problem.
Don't forget to replace the bleed screw and open the isolator valves.
Long term solution to this is to flush and clean the system and add
inhibitor, alternatively spin the pump once a week during the summer.


Jerry