Stoves 720EF Electric Double Oven Logo
Posted on Jan 24, 2011
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Have a stoves 720 es main oven fan does not stay on to cool oven after switch off> also the oven will not trun back on when it is still hot or warm ? will

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  • Expert 250 Answers
  • Posted on Feb 05, 2011
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First things first. There are two fans. One in the bottom oven and one to provide background cooling. The background cooling fan turns on when anything is turned on. (Fan oven/top oven/grill). Just operate the top oven for a moment and this should cause the cooling fan to operate. There is a printed circuit board that controls the cooling fan and for how long the fan should stay on once everything has been turned off. (About 7 mins). If this fan is not running then the fan/motor could be faulty, or the circuit board or the resistor on the fan terminal block. The reason the oven will not turn back on is that the residual heat in the oven unit as a whole against the fan oven, is probably too high which causes the overheat device to operate.
You will have to take the oven out of the kitchen carcass, take the top and rear panels off and get an electrician to test and found out which item is not working/failed. Try espares for parts.

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Sounds like the oven thermostat stuck, for whatever reason and then the oven overheat thermostat kicked in. At the very least, I think you will need a new oven thermostat and possibly an overheat one as well. On the 720 there are two, one for each oven, so when you take the oven to bits, check both out.
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On the 720 there are two thermal cut outs. Looking at the wiring diagram, the cooling fan and the clock are the only two items that will run independant of the cut outs. So, is the cooling fan running ok or not? If it is and the grill is cutting out, then it could be the thermal cut out that has aged - or the fan may be running slowly because of age or there is a build up of dirt grease under and around the oven and on the outlets that stop air curculating properly.
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Is the background cooling fan running? Also, look under the oven and if possible take off the kick panel and clean all the rubbish out to ensure the cooling fan can circulate air round. As a check, when you turn any part of the oven on ( Main/top/grill) the cooling fan will run and you will feel a cool draft of air coming out of the gap just above the top of the main oven door. If the fan is not running, this will cause the unit to overheat and the overheat thermostats to kick in, turning the oven off.
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When you say the main fan, do you mean the background cooling fan or do you mean the circulating fan in the bottom oven?
Do you have the handbook for this oven as the wiring diagrams are included in it. If you haven't, you can take a copy from my BT Digital Vault - all I need is an email address to register you.
Looking at the diagram, the power for the cooling fan comes via the timer board. If, as you say, the fan doesn't work at all, the timer board could have gone faulty.
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