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David Empson Posted on Feb 24, 2018

Faulty obsolete (20yr old) oven thermostat with separate fan/light switch. Can't find a 'universal' replacement. If I fit a standard 2 tab thermostat, the fan and light will switch with the element

Stoves oven DF550 SI with a 46thc502/G5 thermostat which controls well (if 40C higher relative to the oven thermometer). However after an overnight cool down the oven element switches on when the mains is turned back on, even though the oven control is off. I just twiddle the oven thermostat control slightly and all is well. I can't find a 250C, 1m phile, 24mmx6mm spindle thermostat with a separate connection tab for the internal recirculating fan and oven light anywhere. Otherwise the single oven cooker works and looks like new (nearly). I was wondering whether I have to piggy back a switch on the back of a standard 2 tab thermostat (or vica versa) or attach a separate switch to the oven. Can't believe I'm the only one with this problem. I'm guessing some fragile electrical contact occurs in the thermostat on cooldown to turn on the element and its in-series lamp, and this contact easily breaks by slightly turning the thermostat. ps there is no timer and I do have the circuit diagram. I found a working solution to this problem: When turning off the oven, I don't take it to the end stop. I turn it passed the click when the element and indicator turn off, then further till the ligth and fan turn off and just a fraction further but not to the end stop. Now the oven element doesnt turn on each time I turn the mains on for some other reason ( eg grill or igniters). I guess there is something wrong inside the thermostat, but this work arround seems OK if not ideal. I've marked a new stop position around the oven dial to remind me. This was easier than making a physical stop for the oven dial.

5 Related Answers

douglas smith

  • 1462 Answers
  • Posted on Sep 07, 2008

SOURCE: AEG D2160 Double Oven - electrical fault

you may find that one arm of the oven selector switched has fused to its contact.

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douglas smith

  • 1462 Answers
  • Posted on Nov 29, 2008

SOURCE: Neff B1432 2002 Element blown

did you check the old element with a multimeter to make sure it is in fact faulty?
check continuity across the thermostat as well

Anonymous

  • 250 Answers
  • Posted on Nov 16, 2009

SOURCE: Stoves 720EF - main fan not working

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.

Anonymous

  • 133 Answers
  • Posted on Dec 15, 2009

SOURCE: The bottom (fan oven) of my Neff U1721 made soft

The power to the fan and thermostat is the fault. You will need to trace wiring from these elements to power source and I suspect that where the power cord meets the oven is where you'll find the cause.

barkencoa

Barry Coates

  • 3463 Answers
  • Posted on Jun 06, 2010

SOURCE: My Neff Main Electric oven does not heat up, the

If the thermostat light is lit, then it cannot be the temp control, as this what is causing the light to work, indicating that the power is there . I f I were you, I would ascertain that you are getting a feed to the element.
If you are, then new element is faulty, if no feed then you need to trace the wires back to thermostat and work from there.

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