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My oven is not cooking food as quickly as it used to AHY3120?

I have a Hygena cooker AHY3120. I cooked a cake the other day and left it for the same amount as I always do and it was undercooked. Flapjacks took 15 mins longer than normal and chicken took an extra 20 mins too. What would be wrong? Thermostat?
Claire S, May 2014
link Click here to see other fixes for Hygena.