worcester 24i junior, no heating, hot water fine

[gooner49]

have a 24i junior, hot water working fine but when heating called on a couple of rads get hot then boiler shuts down, flow within a metre of boiler very hot, after a metre and return just warm, any ideas greatly appreciated

 

[adlplumbing]

have u been toping presure up alot if so bled the rads

 

[gooner49]

rads all bled, valves all open too

 

[adlplumbing]

right still no joy right pump might have gone
but its just a guess

 

[boilerdoktor]

Bi thermal heat exchanger, pump works on h/w also! This sounds simply like a circulation prob! Have you got a room stat?

What diameter is your pipework to rads?
Are all valves open?

what is the system pressure?

 

[ismellgas]

try bleed the pump and manually turn it to ensure its moving ok, also check pump speed if possible.
It could also be thermistors taking a false reading and cutting heating off before it has had a chance to circulate..

 

[gooner49]

Pump bled and running, room stat fine, 15 mm pipes to rads

 

[adlplumbing]

check the flow and return pipes and see if u can feel if they get hot

 

[gooner49]

flow red hot within metre of boiler ten cooler, return warm

 

[adlplumbing]

well its one of theses
the pump has gone
primary heat exchanger is scaled
or you have an air lock
finaly your heating pipes are slugged up

 

[kevplumb]

well its one of theses
the pump has gone
primary heat exchanger is scaled
or you have an air lock
finaly your heating pipes are slugged up

final answer

you still have a lifeline left

 

[adlplumbing]

well its one of theses
the pump has gone
primary heat exchanger is scaled
or you have an air lock
finaly your heating pipes are slugged up

final answer

you still have a lifeline left

can i phone a freind