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Smeg se378mfx5 Oven Will not Heat

by / Tuesday, 09 May 2017 / Published in

Oven will not heat, Fans working but no thermostat light. Cut-off safety switch suspected

Eric Buttolph

Paul answers

I will try and help with this problem with your Smeg SE378MFX5 Oven

The first thing you need to check if the element is good. It is quite difficult on this Smeg SE378MFX5 Oven as they fitted a couple of different elements during the production process​, 2700 watt​ and 2000 watt were the most common. But without a serial number, I can not tell you which but if you take the element out you will see the wattage on the mounting plate. But as you say the thermostat light is not showing on, I suspect that you may have a fault with either the selector switch which you need to take out and visibly inspect the contacts,​ there is a possibility that it may be a thermal Cut-off safety, ​you will be able to inspect this using a multimeter checking that you have continuity. I have put some videos below to assist you in your repair.

 

For your future reference, I’ve included some Common faults with these Smeg se378mfx5 Oven cookers to assist you in the future or anyone else reading this.

  • The oven will not turn on
    The first thing you need to check is that the oven timer is not on auto if it turns it on to manual.
  • No Heat in Oven
    If the fan is running and the thermostat light comes on but you get no heat (or just the thermostat light on in non-fan ovens and cookers) then the probability is that the fan element or oven elements have failed.
  • Electricity trips (Rcd) when I turn the oven on or grill
    This is normally an element that has gone to earth, This is a well-known fault with electric ovens, the insulation breaks down in the elements and trips the RCD, best way is to stick a meter on each element and check that they have not got earth leaks on them. But this can also be a wiring fault.
  • The grill element doesn't work
    This would usually indicate that the grill element is faulty. Check these: Grill element, Oven changeover switch, Overheat thermostat, Main oven thermostat if used to regulate the grill temperature.
  • The oven fan is not working or spinning correctly (slow) or is noisy
    The fan motor may need to be replaced see the video on this also the cooling fan motor can cause the same problems.
  • The oven overheats and burns everything
    Normally this is a simple thermostat failure which would manifest itself as this symptom.
  • The oven or cooker cuts out after it's been on for a while
    This is an overheating problem which can be caused by the fan motor or main oven thermostat or a faulty safety thermostat that will be causing the problem. It can also be caused by a failure of the cooling fan, where fitted, but usually, these go noisy before failing, Safety thermostats are used to prevent the oven or cooker overheating and will shut the oven down.

If you need any more help on this Smeg se378mfx5 Oven feel free to send me an email. All the best Paul.

If you need any further assistance please feel free to contact me​. all the best Paul​.

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Paul Charmbury
Appliances Engineer
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One Response to “Smeg se378mfx5 Oven Will not Heat”

  1. Ian says : Reply
    June 16, 2019 at 7:57 pm

    Smeg free standing cooker (model SUK62MFX5) oven not heating, fan and light working , checked element it looks perfect and tested to be ok, but no power going to it !!

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