Very strange electrical issue, thoughts?

[Bill Douglas]

Originally Posted by beepbeep

I reckon there is self-inflicted resonance circuit and that outlet just happens to have right wire length for that oscillation to occur. Chinesium parts are very bad when it comes to spreading interference back to network. There is probably chopper step-down circuit in the heater which is not damped by condensator (saves 50c) and that is feeding back. Oscilloscope should tell...

I had that happen once. The electrician said I happened to have exactly the right amount of cable for this to occur

Wave forms bouncing back etc.

[908/930]

As others have said check that plug under load and see if the voltage stays up, the poor connection can also be where that plug is wired from, do you know where the wire feeding that plug starts. Do you have anything driven by a VFD on that circuit, like an exhaust fan or fridge?

[dad911]

Originally Posted by beepbeep

I reckon there is self-inflicted resonance circuit and that outlet just happens to have right wire length for that oscillation to occur. Chinesium parts are very bad when it comes to spreading interference back to network. There is probably chopper step-down circuit in the heater which is not damped by condensator (saves 50c) and that is feeding back. Oscilloscope should tell...

Plug in a heavy duty extension cord (lengthen the wire) and see if it goes away.

[greglepore]

Originally Posted by dad911

Plug in a heavy duty extension cord (lengthen the wire) and see if it goes away.

Just did this tonight, it doesn't. Moving the cooker from the outlet while using the cord doesn't help. There are three other outlets on the circuit (fridge on one) and it works fine on the other two (non fridge) outlets.

I did have led lights in a nearby range hood fail around the same time' Hood on a different dedicated circuit, maybe transformer is somehow causing rf, but it must be in the line, as I had the thing 10 ft away and it malfunctioned.

It worked fine on the troublesome outlet for two years prior.

Have warranty parts coming for the hood, will install. But issue is there whether transformer energized in hood or not.

[908/930]

Probably the fridge compressor motor, or the fridge controls. Some older motors have a capacitor, and some newer ones use inverter drives, both can cause noise in the AC line.

Just the compressor cycling on is likely create a low voltage dip on that circuit, possibly resetting the controller.

[dad911]

The fridge is on the same circuit as the sous vide? If so, try the fridge on a different circuit with an extension cord and see if the sous vide works.

Refrigerators should be on a dedicated circuit, and are by code in new construction.

[greglepore]

Originally Posted by dad911

The fridge is on the same circuit as the sous vide? If so, try the fridge on a different circuit with an extension cord and see if the sous vide works.

Refrigerators should be on a dedicated circuit, and are by code in new construction.

Its also on the same circuit as two other outlets that work with the sous vide, and one is closer.

[dad911]

You can rule out the fridge by using a heavy duty extension cord and plugging the fridge into a different circuit.

[flatbutt]

Greg, time to sell the house while the market is hot.

[greglepore]

Originally Posted by flatbutt

Greg, time to sell the house while the market is hot.

Funny that you say that, we put an offer in on a place today...

[billybek]

Is the refrigerator an inverter type compressor?
No idea if this could contribute but merely curious.

[greglepore]

Originally Posted by billybek

Is the refrigerator an inverter type compressor?
No idea if this could contribute but merely curious.

no clue-its 3 year old kitchen aid.

What's really got me stumped is that this all worked fine, fridge, sous vide, everything, for almost 3 years.

[svandamme]

Bit surprised nobody has yet suggested to check the ground on that socket

[dad911]

^^ post 20..... but current should not be travelling through the ground.

I still think it's a poor connection somewhere.

Measure voltages under load, or see if a simple old-style incandescent light plugged into the same outlet flickers when running the sous vide.

[svandamme]

Originally Posted by dad911

^^ post 20..... but current should not be travelling through the ground.

I still think it's a poor connection somewhere.

Measure voltages under load, or see if a simple old-style incandescent light plugged into the same outlet flickers when running the sous vide.

it shouldn't but it could be that the ground is not ground
and some other appliance leaks. and affects this one or vice versa

[1990C4S]

Originally Posted by greglepore

I cook sous vide using an anova immersion circulator, which has a built in pid temp control. When plugged into a specific outlet in my kitchen, the unit continues to heat beyond the setpoint.

The fact that the device heats, and heats beyond the set point, implies that he probably does not have a power issue.

Does the device even have a ground pin?

Have you re-tested your hypothesis? You could just have a flakey device....

[greglepore]

Originally Posted by 1990C4S

The fact that the device heats, and heats beyond the set point, implies that he probably does not have a power issue.

Does the device even have a ground pin?

Have you re-tested your hypothesis? You could just have a flakey device....

Yes, the device has a ground pin.
Yes, I used a different brand immersion circ, brand new out of the box (initially thought mine was bad) and it behaves the same way on this outlet, but fine on the others.
Tested for ground and load, didn't test for leakage to ground, will do that, but have swapped outlet with no effect.
I see dead people....

[stevej37]