Problem, Check, Z C G 7 5 5 1 7 5 5 0, What is wrong and why

Problem
The ovens are not cooking evenly.
Check
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Check that the appliance is installed properly and is level.
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Check that the main oven roof is pushed fully back into position.
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Check that you are using the recommended size baking trays. 
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Check that you are using the recommended temperatures and shelf
positions.
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If you are cooking a large item be prepared to turn it round during
cooking.
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Turn round all food in the second oven.
Problem
The oven light will not work.
Check
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If the light does not work you probably need to replace the bulb.  
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Check there is not a fault with the electrical supply. Check this by
pressing the ignition button. If you cannot hear sparking there is
probably a fault. 
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First, check the socket by trying out another electrical appliance in it,
if that works renew the fuse in the plug. Use a 3 amp fuse. If the fuse
'blows' again this indicates that there is a fault on the appliance. Do
not use a fuse with a higher rating than 3 amps. Do not carry out
further electrical work. Unplug the appliance and inform your
installer.
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Z C G   7 5 5 1  / 7 5 5 0
What is wrong and why?