[user_12345a]

See attached.

The schematic is from an electrolux made electric range which uses a circuit board to control the oven.

Does anyone know what kind of voltage/current the sensing circuit runs at?

The circuit leading to "temperature probe".

AC or DC, low or high voltage.

There's no ladder diagram and no service manual available anywhere.

 

[BayouRunner]

See attached.

The schematic is from an electrolux made electric range which uses a circuit board to control the oven.

Does anyone know what kind of voltage/current the sensing circuit runs at?

The circuit leading to "temperature probe".

AC or DC, low or high voltage.

There's no ladder diagram and no service manual available anywhere.

I can’t say that I would know for sure but I’m not sure what your trying to accomplish. If you were having issues you would check the sensor by ohms.i suspect voltage would be low dc, but I’ve never checked one for voltage before.

 

[surferdude2]

Depending on the type of thermocouple transducers used on residential ovens, they can produce (output) as high as 15 millivolts d.c. at the highest temperature they are subjected to and 5 millivolts or less as the temperature decreases. It takes some complex circuitry, with high stability, to make use of such low level d.c. voltage.

edit: If we assume you are measuring the commonly used type K thermocouple, the following chart will be of assistance:

Type K output vs temp
+
+

 

[user_12345a]

it's a thermister i believe. i know to check resistance.

Voltage checking is useful because there's a thermal limit in series with the sensor and i can tell if the circuit is being interrupted without removing the top which is where the cutout and board are located.

it's an intermittent open circuit error.

 

[BayouRunner]

Should read roughly 1050 maybe 1100 ohms on the sensor at room temp. I really feel is would be dc volts less then 5 volt range but really can’t answer. I’ll ask the guys at work but I’ve not heard of checking for voltage. Reason being if the ohms are good then the board is bad. But I suspect you would measure for voltage and voltage would change with temp change. Unfortunately I don’t have any access to Electrolux data. And yes that would be a thermistor

 

[user_12345a]

When there's a thermal limit in series with the sensor so it could be that.

It could be a bad connection anywhere which only shows up when it heats up.

Thermal limit cuttout out or bad connection upstream would show up measuring voltage being applied.

i doubt the thermister itself is bad.

 

[BayouRunner]

There also is usually an additional limit at the top of the oven as well. Might want to check for that


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