Why is radiator in hall no TVR hot when boiler is switched off

[jsm]

Radiator in hall has no TVR, thermostat on hall wall set to frost protection and boiler set to hot water only, however radiator in hall is producing heat? Why is this and why needs to be done to solve issue?

 

[SimonG]

First up is you need to provide extra info.

What boiler is it?

 

[jsm]

First up is you need to provide extra info.

What boiler is it?

Ideal Logic 30

 

[SimonG]

Ideal Logic 30

Diverter.