back boiler problem

[jabbathehut]

the backboiler is not heating rads or hot water, a new grundfos pump was fitted and still the same problem, the flow pipe that comes directly from the boiler is only luke warm after fire being lit for 2-3 hours.... the system is full...all suggestions welcome thanks

[wnjswozo]

you need a gsr engineer to look at boiler,has it been serviced at any time,could be a few things wrong,blocked h/e,incorrect gas pressure
,boiler stat

[jabbathehut]

thanks for the reply but its a coal fire that heats the water in the back boiler, no gas..

[justlead1]

Hi. The answer is burn more fuel.