no heating

[Debbie78]

i have a roylat type rr4 and as most heating does as it gets cold stops working.
I used to have to bleed the bathroom radiator quite often during the cold months however this time round none of it is working
The rads don't seem to have any water in them the water pump has been replaced so not thinking it is that anymore.
Any ideas please house now very cold

 

[MANDATE]

What makes you think the rads don't have any water in them?.
The whole system is based on water to transfer the heat, If there's no water, then there's nothing to pump around.
You need to verify there is water in the expansion tank( float valve may be stuck).
It could be that water is there in the tank, but a blockage in the pipe work is preventing the water entering the system.