Is it possible for a pump to be working but not at full power.Some of my rads furthest away from the boiler barely get hot. I have cleansed the system with sludge cleaner so should be clear.
Your rad's may need balancing, especially if you drained down to add the cleaner, close the rqads that are hot n wait for the cold ones to warm then open the others a touch, hope this helps
Stag Heating TMSGAS, December 2010
You may have air in th system. if so you need to bleed the rads with a rad key or flat ended screw driver on each rad, do not remove the bleed screw just open it up till you hear the air coming out then followed by water if when you open the screw and water comes out this rad is ok. The system should run at around 2 bar, top up the system and bleed the rads to get the air out of each rad. Do not forget to top up system after each rad bleed.
Hope this helps
