Question about Miele 24 in. G646SC Plus Free-Standing Dishwasher

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My Miele dishwasher is not heating the water.

The element measured 30 ohms which I assume is normal for a 240v system. Does anybody have any ideas.

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  • Robert James Jul 16, 2007

    If I had a wiring diagram that was what I would have looed at next. However I put it together again and ... it worked. So for now problem solved thank-you.

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You would need to look at the wireing diagram and find out if there is any thermostats that I'm sure there are. You would need to find out if they are working properly.

Posted on Jul 13, 2007

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I have the same unit and the same model number. Mine also not heat up. upon investigation I noticed the heating element has a 4 wires which I believe each pair (2 wires) meant for 100/120V and the other one is for 220/240V. I checked 2 wires (1 pair) has an open circuit while the other pair is ok. I directly connected the heating element to the power and it was heated up. I measured the resistance and it was around 78 ohm. from my lame calculation this is for 100/120V heating element. the 220/240V was busted.

Since mine on 220/240V power grid, to use the working 78 ohm heating element the estimated power would be P=VxV/R, around 738W which is way too high than the rated power (365W) for this voltage. I plan to add the dummy resistor 82 ohm + 78 ohm heating element to reduce its power around 370W. Hope it works.

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I have replaced the bottom element,and now i have no hot water. I check with a meter and have power to the top element but not the bottom one.


First of all, you have 240V water heater because tank has two elements.
You have no hot water, and tank has power to upper element.
Lower element has no power.

Something doesn't sound right.
You're not testing correctly.

Before doing anything, test across top two screws of upper element for 240Volts.
This will eliminate electrical problem as suspect.
Breaker must deliver 120V on both legs to complete the 240V circuit.
Every single-phase household circuit takes 2 wires to complete the circuit.
With 120V you need 1 neutral wire and 1 hot wire to complete circuit.
With 240V you need 2 hot wires, one from each hot busbar, to complete circuit.
Your water heater can appear to have electricity if breaker is delivering power on one leg of the 240V circuit.
To check breaker for sure, move wires to another similar size breaker to see if water heater functions properly.
http://waterheatertimer.org/B220C.html

If 240V circuit is good, then next thing is take 30 minutes and do full test of water heater parts.
This will identify exact problem(s) without guessing.
Buy 5$ multimeter from Home Depot. Install battery.
When test calls for continuity, rotate dial to Ohms (upside down horseshoe is ohms).
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http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

Add a comment for more help.

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I have a 240V hot tub and when I turn on the Cutler-Hammer GFCB250 GFI Circuit Breaker, 50A, it trips immediately. I spoke with a tech support guy from the hot tub mfr who says that the heater and pump...


It is very possible breaker is bad. If you have another 50 amp breaker in the box try swapping them and see if it still trips. GFIC breakers are finicky and they do go bad. I would make sure that the heater is not shorted out before replacing the breaker. It shows 15 ohms which is not what you would normally see which is 9-12 ohms. The reading of 15 ohms you got is high but if the manufacture says that is acceptable then we must assume it is. You also need to test for a short before eliminating the element as a possible cause. Test it with your ohm meter set to the highest setting. Measure between one element terminal and the sheath of the element. Any reading indicates a short to ground indicating the element is bad. If you find it is good then a defective GFCI is really about all it can be.

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Hope this info helps, ps don't forget to give me a rating thanks!!


For an electric dryer that runs but doesn’t heat, follow this repair roadmap:
Flip the circuit breaker off and then back on. Electric dryers run on a two-pole, 240v breaker. A common problem is for one of the legs to break which cuts the 240v that the elements need to heat up but it still supplies the 120v for the motor. The result is that the dryer runs but doesn’t heat.
If the breaker checks out, then it’s time to do some surgery. Unplug the dryer and open it up.
. Use your ohm meter to test the thermostats. All should show continuity.
Measure the resistance of the heating element with your ohm meter. Normal readings are in the neighborhood of 30 ohms.
In rare cases, the centrifugal switch in the motor can fail which breaks the power circuit for the heating elements. If this is the case, then the entire motor must be replaced since the centrifugal switch is built into the motor.

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Hope this info helps, ps don't forget to give me a rating thanks!!


For an electric dryer that runs but doesn’t heat, follow this repair roadmap:
Flip the circuit breaker off and then back on. Electric dryers run on a two-pole, 240v breaker. A common problem is for one of the legs to break which cuts the 240v that the elements need to heat up but it still supplies the 120v for the motor. The result is that the dryer runs but doesn’t heat.
If the breaker checks out, then it’s time to do some surgery. Unplug the dryer and open it up.
. Use your ohm meter to test the thermostats. All should show continuity.
Measure the resistance of the heating element with your ohm meter. Normal readings are in the neighborhood of 30 ohms.
In rare cases, the centrifugal switch in the motor can fail which breaks the power circuit for the heating elements. If this is the case, then the entire motor must be replaced since the centrifugal switch is built into the motor.

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Hope this info helps, ps don't forget to give me a rating thanks!!


For an electric dryer that runs but doesn’t heat, follow this repair roadmap:
Flip the circuit breaker off and then back on. Electric dryers run on a two-pole, 240v breaker. A common problem is for one of the legs to break which cuts the 240v that the elements need to heat up but it still supplies the 120v for the motor. The result is that the dryer runs but doesn’t heat.
If the breaker checks out, then it’s time to do some surgery. Unplug the dryer and open it up.
. Use your ohm meter to test the thermostats. All should show continuity.
Measure the resistance of the heating element with your ohm meter. Normal readings are in the neighborhood of 30 ohms.
In rare cases, the centrifugal switch in the motor can fail which breaks the power circuit for the heating elements. If this is the case, then the entire motor must be replaced since the centrifugal switch is built into the motor.

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Hope this info helps, ps don't forget to give me a rating thanks!!


For an electric dryer that runs but doesn’t heat, follow this repair roadmap:
Flip the circuit breaker off and then back on. Electric dryers run on a two-pole, 240v breaker. A common problem is for one of the legs to break which cuts the 240v that the elements need to heat up but it still supplies the 120v for the motor. The result is that the dryer runs but doesn’t heat.
If the breaker checks out, then it’s time to do some surgery. Unplug the dryer and open it up.
. Use your ohm meter to test the thermostats. All should show continuity.
Measure the resistance of the heating element with your ohm meter. Normal readings are in the neighborhood of 30 ohms.
In rare cases, the centrifugal switch in the motor can fail which breaks the power circuit for the heating elements. If this is the case, then the entire motor must be replaced since the centrifugal switch is built into the motor.

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Hope this info helps, ps don't forget to give me a rating thanks!!


For an electric dryer that runs but doesn’t heat, follow this repair roadmap:
Flip the circuit breaker off and then back on. Electric dryers run on a two-pole, 240v breaker. A common problem is for one of the legs to break which cuts the 240v that the elements need to heat up but it still supplies the 120v for the motor. The result is that the dryer runs but doesn’t heat.
If the breaker checks out, then it’s time to do some surgery. Unplug the dryer and open it up.
. Use your ohm meter to test the thermostats. All should show continuity.
Measure the resistance of the heating element with your ohm meter. Normal readings are in the neighborhood of 30 ohms.
In rare cases, the centrifugal switch in the motor can fail which breaks the power circuit for the heating elements. If this is the case, then the entire motor must be replaced since the centrifugal switch is built into the motor.

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