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Magic Chef 3868XVW Oven Tripping Circuit Breaker


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9 replies to this topic

#1 mangusta1969

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Posted 01 September 2011 - 01:48 PM

What could cause an intermittent circuit breaker tripping problem by a 15 year old Magic Chef 3868XVW oven? The bake element gets hot, but there is a problem with the unit periodically tripping a 50 amp 220V breaker. The broil element works fine by itself.

I pulled the bake element out and checked its DC resistance at 21 ohms with my multimeter. This seems about right to me, is it?

The only thing I can figure is that the bake element may periodically short out (0-1 ohms or so) during heating cycles, causing the circuit breaker to trip. There are no bubbles on the bake element and the DC resistance does not change when I slightly bend the detached element when I am measuring the element.

MagicChef does not have any service info or schematics on this model, can someone provide one to me??
Anyone have any ideas what might be causing the intermittent circuit overloading problem?

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#2 RegUS_PatOff

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Posted 01 September 2011 - 01:57 PM

the Element wouldn't short out by itself,
unless it's touching the chassis (ground) at times ..
Does this happen when only when Baking and / or when Broiling ?
It may be a defective house Circuit Breaker

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#3 mangusta1969

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Posted 01 September 2011 - 02:20 PM

It only happens when baking, that's why I don't suspect the circuit breaker is the problem. The broiler works fine by itself, as I stated. The element didn't seem to be shorting out to the oven chassis (no burn marks; clearance at the the two through holes looks fine). Thanks for the fast response! Any other ideas?

I am about to test the removed bake element by itself on a separate 120V circuit and then on a 220V circuit. I also have a high current AC ammeter someplace. I just have to find where I stashed it.

I would think that the broiler element and the bake element share the same controller inside the oven, but perhaps there are some relays involved which are causing the problem. Magic Chef was a pretty low end mfr of ovens/ranges, so I Imagine that the design is as simple as it gets.

#4 RegUS_PatOff

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Posted 01 September 2011 - 03:06 PM

the Element wouldn't draw more current than designed ..(It's resistance can't decrease)..
The Broil Element may normally draw less wattage than the Bake Element.
The Circuit Breaker may still be weak.

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#5 mangusta1969

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Posted 01 September 2011 - 03:33 PM

I'll hope for a bad circuit breaker, as the only other culprit is probably the solid state clock/controller, which is a pricey part. If it's not the circuit breaker, it will probably be new oven time. Thanks for your suggestions.

#6 RegUS_PatOff

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Posted 01 September 2011 - 03:53 PM

I'll hope for a bad circuit breaker, as the only other culprit is probably the solid state clock/controller,

the Controller can't send it more current ...

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#7 mangusta1969

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Posted 01 September 2011 - 04:54 PM

the Controller can't send it more current ...


What about an intermittent internal short in the solid state controller or in the relay that feeds the bake element? I think there are two separate solid state controller circuits (one for broiler; one for baking), but I am speculating in the blind since I have no schematic. I will be trying a replacement 50 amp breaker shortly and will report back to you. Thanks for the rapid fire responses.

#8 RegUS_PatOff

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Posted 01 September 2011 - 09:33 PM

What about an intermittent internal short in the solid state controller or in the relay that feeds the bake element?

not likely, it would then probably blow the Relay for good and / or some wiring

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#9 mangusta1969

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Posted 04 September 2011 - 01:24 PM

not likely, it would then probably blow the Relay for good and / or some wiring



RegUS,

You are the Master! Thanks for your sage advice and quick responses.

It was a weak dual pole 220V circuit breaker. I guess the breaker's overload trip point reduced itself to something below what the 21 Ohm bake element needed for current flow, even though it flowed enough current for the broiler element to work properly. A new circuit breaker cured the problem. I'm glad I don't have to purchase a new range.

#10 RegUS_PatOff

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Posted 04 September 2011 - 02:11 PM

RegUS, You are the Master!
It was a weak dual pole 220V circuit breaker.

:whistling:

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