There is condensation on the inside of the cooker door
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It is normal for steam and condensation to build up in the oven during and after cooking, especially food with a high water content (e.g., frozen chips or chicken).
To minimise steam and condensation being produced, avoid leaving food in the oven to cool down after being cooked.
Pre-heating the oven before placing the food into the oven can help reduce the amount of condensation being produced