Neff U1452 tripping electrics

sounds like you need to replace the thermostat unit.

call chas&son,s at 570-379-0993 and they will come out the same day no less okay

install a new fan again and try again

Use link
http://www.neffcustomerservice.co.uk/
click on instruction manual download (bottom left of page) this will open new window, enter U1452 in search box... click on first result and go to page 36 of downloaded PDF this will give you the instructions.
All the best, hope this helps

If the fan is working o/k, then you need to replace the oven element located at rear of oven compartment behind a removeable cover.

Depends on whether you purchase a genuine element or a copy one.
You could get a copy one for under £10.00, or pay as much as £30.00 for a genuine element.

they should last 12 months minimum there could be a problem with your fan motor here is a standard fan oven check list.

You-Tube video "6QGurNvbI0Q" placeholder (do not delete)

For all Free appliance repair videos visit our VIDEO TUTORIALS 1, If the fan motor in the back of the oven is going round and the temperature light is on (normally little red light), but there is no heat then you will probably need a new oven element, these are generally very easy to fit and readily available from our website these can be tested with a electric meter.
To gain access to the element you will have to remove the back plate from inside the oven. Once removed you will see the fan and element, if you look closely at the element you will probably see a small hole burnt in it where it has blown. Sometimes however there is no evidence of a fault but the element is open circuit ie: broken inside the element casing, either way it will need replacing. Some elements will are fixed from inside the oven and some are held in place by nuts from the rear of the machine.
2, If your fan oven is getting warm but takes a very long time to cook or is burning the food more on one side than the other, then you need to check if your oven fan motor is working you will see the blade turning fast if it is ok. if the element is heating but the fan motor is not blowing the heat into the oven then you need To replace the oven fan motor is a little more expensive and a bit more involved.
3. If you have the opposite problem ie: your oven is over heating and burning everything then you will need to replace your oven thermostat
4, A quite common and easily overlooked answer is if your oven is not working at all ie: no heat and no fan then the chances are that someone has put the oven timer into AUTO mode, simply put oven back to MANUAL mode and all should be working again.

I have a u1421 with the same problem! I notice the fan doesnt run too well, sometimes it doesnt run at all, needs a prod to get it running. I suspect with no fan, that the element gets far too hot, and then starts to leak to earth, tripping the RCD. I'm gonna try buying a new fan motor - you should ckeck if your fan is running full speed OK.

probable fault to earth of circular element - gets worse when element hot. you will need a megga to confirm this.