Powerflushing ​ Powerflushing will not remedy the design or mechanical faults in a heating system, which should be rectified, but in many cases it will cure the problems caused by these. When the sludge in a heating system starts to build up typical problems are: Radiators cold at the bottom Radiators cold at the top and need frequent bleeding No heat distribution to the radiators or very poor Boiler cutting out Noise from boiler Poor or no hot water High Fuel Bills Boiler fa