Belling 627gr, ser 60100223
Due to all four regulators failing, new regulators were fitted, Belling No 082604436, generic hpt 6204034 (6201721).
The rings work fine, but do not regulate. Set the dial to 1 the ring stays on full until you reduce the dial to below 1, it then regulates the ring to off.
If you set the ring to max the ring runs until the overheat glass thermostat kicks in and it regulates on the thermostat.
Any ideas as to what is going on ?