hot water but no heating

[Kenneth1]

We have a dual heating system, a solid fuel stove with back boiler and a external kerosene heater.

The kerosene heater is working fine heating the radiators and the water for the taps
The solid fuel stove will heat the water for the taps but the radiators will only get luke warm.

Can anyone help me as to why this is happening ?

 

[exedon2]

Has the solid fuel boiler ever heated the radiators fully?
Do you have a heat leak radiator that's getting hot?