2 Tall radiators not getting hot only tepid

2 Tall radiators not getting hot only tepid

2 Tall radiators not getting hot only tepid

Hi All
I have 2 tall rads in the kitchen thats only getting tepid, I have tried to balance the system and can get the 2 rads hot but when I open up the rest of the rads the 2 tall ones go tepid again, I have a Vailant Ecotec 615 plus with 13 rads. I had the pump in the boiler replaced about 2 years ago as it wouldn't heat upstairs.
Any ideas of how to solve this please.

by Tally101

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