If your cooker runs on gas rather than electricity, it is important to make sure that your pilot flame is always lit while cooking. A thermocouple uses temperature readings to detect whether or not this flame is burning; if the flame goes out, the thermocouple will sense the temperature drop and stem the gas supply until you re-ignite the flame.
This is important for two reasons. If gas is allowed to seep into your oven, this represents both a waste of energy and a considerable safety hazard. To prevent the build-up of flammable gas in your oven, check that you have a working thermocouple and replace it with this genuine spare part if necessary.
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