The oven was on and working..then the electric tripped and all power went off...after putting the switch back up on the fuse box everything on the oven started working but it does not get hot!!.......ie....the grill works and the fan is working and the timer and lights r working but wen on oven setting it will not heat up....please help...the oven is about 5 years old so can it b fixed or do i need to buy a new one???

This tutorial will show you how to check your Zanussi element and how to replace your Zanussi cooker element.
Here are the 3 main faults to look for in your oven or cooker that is not heating
Your oven will not work until the clock/timer has been re-set after replacing an oven element or tripping the electrical supply. Consult your Zanussi manual.
If you're Oven is not getting hot or heating up it could be a faulty element, if the fan in the oven is running and the thermostat light is on, this will lead us to believe that the element has gone faulty. With grills the thermostat light should come on there should be heat, if not then this could be the grill element or the thermostat.
When you turn the oven on, the household electrical supply trips on the Rcd (this is the earth trip in the fuse board sometimes called the breaker tripping) your fan oven element has gone to earth and needs replacing.
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If the electrity tripped due to an un forseen problem i.e.no DIY disasters, I would say that the element for the oven is " breaking down" and caused the electric to trip. The oven element is generaly located under a metal plate in the bottom of the oven and its electrical terminals can be accessed from the rear.

The elements are certainly cheaper than a new oven and are not difficult to replace.

If you go down the repair route and live in the UK, I would recommend e-spares on line.

Hope this helps.