Grant 50/90 Riello RDB not working

[kimbo]

Can you hear a slight humming or buzzing noise from the boiler, check to see if you have a live supply to the burner.Something may have seized such as the pump or motor or even the capacitor might not be generating enough power to start the motor, this is usually accompanied by a buzzing noise.

 

[Best]

As the water pump is running, the burner should be getting power. Check limit stat as has been said by a lot of us, & if power is getting to burner, then control box is likely if no lockout.

 

[MJPH]

Hi Tamz, what is the "test switch" to which you refer ?

 

[MJPH]

will try that thanks