problems with my rhino boiler

[big d]

My radiators in my house are playing up.Three of them are staying on all the time.I have changed the thermostat on the wall but this has made no difference.Even when I turn the water and the heating off on the timer the radiators are still red hot.It is a Rhino oil boiler and it is drayton controls. As I said I have bought a new drayton thermostat and I am wondering if I should change the control panel.Could anyone help with this before I need to call in the professionals .

 

[Killy Bing]

Call in an engineer, you'll just cost yourself far more in the long run throwing parts at it