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If your cooker or oven is not regulating it's temperature correctly then it could be a faulty energy regulator that is causing this problem. An energy regulator (or simmerstat) is an "infinite switch" that controls the temperature of a burner or ring on the hob of an electric stove or cooker.
Specification:
SKU: 19600171
SKU: 19600173
SKU: 19600174
SKU: 19600167
SKU: 19600188