Convection needs fan drive to force the air into the oven cavity. The fan may be direct motor drive or belt driven. If the latter the belt may be broken or simply have stretched and come off. Before removing the cover of the oven in attempt to carry out any maintenance such as replacing the Oven cavity lamp, make sure the oven is disconnected from the power point ! The voltages in a microwave oven ARE LETHAL !
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Convection needs fan drive to force the air into the oven cavity. The fan may be direct motor drive or belt driven. If the latter the belt may be broken or simply have stretched and come off.
Before removing the cover of the oven in attempt to carry out any maintenance such as replacing the Oven cavity lamp, make sure the oven is disconnected from the power point ! The voltages in a microwave oven ARE LETHAL !