On Jan 21, 1:56*pm, Gypsygirl wrote:
I have a 12year old potterton suprima . It has been a good faithful
boiler until 3 years ago when the radiators just stopped getting hot
(warm it could manage ) and 2 radiators bairly that . System was flushed
last year and pump is new . Can it be because there is no pump over run,
boiler kicks on runs for about 2 mins then shuts off from wall
thermostat ,water out and water returning red hot (boiler clonks and
ticks) but radiators only warm *?
Am now fixated that the pump should run the hot water around the system
for longer ie adding pipe stat or remote timer but started to read blogs
that say pump over run simply dumps the heat and will not circulate it
round the radiators once the boiler is off ?

Apologies if this is all a bit vague but trying just to post essentials
if anyone is kind enough to respond can add any details required .

--
Gypsygirl

It sounds like the water is not circulating.
There are several possible reasons.
There is air in the pipework.
A valve somewhere is not properly open(ing).
The pump is not running at correct speed/is too small.

Have a look at the pump. Most are multi-speed. If so, there is a
switch on the pump which can be moved to a higher setting.
They usually just a tiny slide on the motor bit, three possible
settings is normal. It will be marked " hi" and "lo" or similar.

Turning it up may well fix the problem. As you have had a new pump,
whoever fitted it may not have set it to the correct speed.