My stoves 720ef oven goes off if it turned up over 140 deg c also the grill in the top oven does not get red hot

Normally, if a grill element fails, it just stops working. So if they are working then on full power, both elements should get red hot! If this is the case, all I suggest is that you try experimenting with different heights with the grill tray. And by the way, don't shut the door when you are grilling as this shuts the grill off!

First things first. The top oven lights ONLY come on when the top oven is switched on. Operating the grill DOES NOT turn the lights on. If you wish to see what you are grilling, you have to turn the top oven control knob on to its first position as well as turning the grill on.
Secondly, the grill only works when the door is open. The grill does not work when you shut the door. When you open and shut the door, you should be able to hear the microswitch operating. It is located in the right hand side of the cooker, between the inner and outer panels - you cannot see it. I haven't seen the switch first hand but they normally come with an arm that contacts the door mechanism and the door mechanism operating, causes the arm to move, which causes a button on the switch to move and make the circuit. It has been known for the arm on the microswitch to bend with use so it no longer works correctly.
If you have checked all above and you hear the switch operating, then it could have failed. They are quite common, so if you can't get one from STOVES, try espares or someone like Maplin or RadioSpares.
The get to the microswitch you have to take the oven out of the housing and then take the right hand panel off. You should then be able to see it and check its operation.
All the best

The unit is working as it should. The top oven lights will only come on when the top oven control knob is turned on. The grill control does NOT turn the lights on. If you want to see what you are grilling, then you should turn the top oven control on to its first position. This works even if the grill is operating.

If the element and the indicator light both stopped working this suggests a problem with the power supply for the grill control. Either the grill control has no power going to it or it is faulty and requires replacement. If you are not sure what you are doing you'd better get a tech. to look at it, it can be fairly complicated for the untrained person.

Supply an email address for you and I will grant you access to my BT Digital Vault where a copy of the complete handbook is lodged. It includes circuit diagrams.

With your fault, can you here the switch operating, if not it just may be stuck?

No, there is no reset button. However, the grill will only work when the front is down as there is a microswitch which operates to provide connectivity when it is in this position. This is to stop the grill overheating. The switch could have gone faulty.
Does the top oven work ok?
When you operate the grill there are two options, part or full. Are they both failing? Does the cooling fan switch on when either grill is operated?

there is a safety stat/fuse on top of the oven exterior i think you will find that it also has blown. Make sure you have isolated the appliance at the fuse board first though, Good Luck

I have a copy of a STOVES 720EF Manual (including wiring info) posted on BT Digital Vault. Supply an email address and I will give you access to take a copy.

parsonm

The grills appear to be independant of each other. Does the oven still work and the oven light come on?

Depending on your answer it could be that the Top Oven Switch has gone faulty. The Grill Regulator and the Switch work together on the top oven. To get at both you will need to take the top of the oven off.

Have the same problem. Went and bought an oven thermometer from Lakeland and found that when the top oven thermostat was set to 160, the temperature only got to 140. I did clean the sensor inside the oven using a cleaner from Lakeland which did improve matters but it is still running cooler that it should. ( It takes at least 20 to 30 mins to warm up)