Newly in house and only 2 of the 4 'rings' work on the hob. Checked supply feed and original supplied with the appliance with black, brown and two blue cables along with earth, replaced with standard live, neutral and earth, seemingly switched from old cooker direct onto the halogen (original slung down the back). Is this likely to be the cause of fault and if so anyone any ideas on locations for the original 5 cables ( earth obvious), there are 6 numbered 'ports' on the hob. Standard UK 240 v supply. No user handbook left. Many thanks