SMEG SUK91MFA starts heating and then cools

[Ed Curtin]

No loss of power no power being tripped. Two fans are turning. Oven starts heating but 15 or so mins in it stops and looses heat

All lights are working timer mode isn’t set ie it’s not like unit is alarming and turning off, the thermo is clicking when turning on off heating manually

Fans are spinning on the elements at the back but the oven stops heating and cools down about 15 mins after food goes in

Thermostat Indicator light always on

Any ideas what I can try before calling in a professional

[electrofix]

bit confusing post

what do you mean by “All lights on time mode isn’t on”

when it stops do the fans continue but heat stops ?

Dave

[Ed Curtin]

Sorry it should of read power isn’t lost and thermo light is on main oven light is on when door opens and digital readout is on.

Unit does not trip anything and yes fans are on but heat stops

[electrofix]

isn’t it funny had exactly the same problem on a smeg yesterday. my unit the fans run and the thermostat light is on but no heat. Im my customers and your unit there are 2 elements. This means there is 4 Kw of heat load which is too much power for the thermostat. Smegs answer is to fit a small power board to switch the load and these can go faulty.

https://shop.ukwhitegoods.co.uk/811650197-oven-electronic-control-board

in my case a small capacitor has blown so hopefully I can find one of an old board otherwise my customer will have no cooker for Christmas

hope you sort it in time

cant promise this is faulty but its high on the list

Dave

[Ed Curtin]

electrofix wrote:isn’t it funny had exactly the same problem on a smeg yesterday. my unit the fans run and the thermostat light is on but no heat. Im my customers and your unit there are 2 elements. This means there is 4 Kw of heat load which is too much power for the thermostat. Smegs answer is to fit a small power board to switch the load and these can go faulty.

https://shop.ukwhitegoods.co.uk/811650197-oven-electronic-control-board

in my case a small capacitor has blown so hopefully I can find one of an old board otherwise my customer will have no cooker for Christmas

hope you sort it in time

cant promise this is faulty but its high on the list

Dave

Thanks for your reply Dave can I ask did you customers unit heat up at all? Mine is heating and then the heating cuts out

[electrofix]

no mine did not but the component that had failed on the board was smoking slightly when I looked

I may be it starts ok then fails. if it was me I would test it to make sure

the way the system works is the thermostat tells the board to turn on the elements and the board closes relays to do that

if it was any kind of overheat stat I would expect a lot more to go off

Dave

[Ed Curtin]

electrofix wrote:no mine did not but the component that had failed on the board was smoking slightly when I looked

I may be it starts ok then fails. if it was me I would test it to make sure

the way the system works is the thermostat tells the board to turn on the elements and the board closes relays to do that

if it was any kind of overheat stat I would expect a lot more to go off

Dave

Thanks one final question you couldnt point me towards where I would find that board

[electrofix]

mine was rear left hand side just above the terminal block

Dave

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