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how do I know if the heating element is bad? part number ap3094254 I've replaced the thermostat and cycler Related

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  #1 (permalink)  
Old 04-12-2011, 05:27 PM
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Default Heater Box/Element
Model Number: teds740pq0   Brand: Roper   Age: 1 - 5 years   

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how do I know if the heating element is bad? part number ap3094254 I've replaced the thermostat and cycler


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  #2 (permalink)  
Old 04-13-2011, 02:14 AM
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Often if you remove it from the unit you will see that it is broken.

First I would check the power.
The motor uses 120 but the heating coil requires the full 240.
Try flipping the breaker off/on slowly a couple times, sometimes you can loose half the line without actually tripping the breaker.
If this does nothing, check the voltage at the plug
L1 to L2 should be 240 volts
L1 to Neutral and L2 to Neutral, both should be 120 volts.
If OK
Unplug the unit and check the wires at the terminal strip in the machine to make sure none are loose or burned out
If OK
Check the power at the terminal strip.
Be careful as 240 volts is lethal !!!

Next check the heating coil using resistance.
Unplug the unit
Unplug the unit and both wires to the coil.
Check it with a meter, should be around 10 to 12 ohms.

If you do not own a meter, I would suggest you purchase a one. You can get a decent digital multimeter for under $20.00. You do not need fancy though it is nice if the leads are a couple feet long.
If it saves ordering one unnecessary part it has paid for itself and you end up owning a useful tool.
Also it will let you check the power.
Most places will not let you return electrical parts so if you order it, you own it.
A couple things to watch when measuring ohms and continuity
1. Always remove power from the machine otherwise you could blow your meter.
2. Always disconnect at least one side of any device you are checking. This eliminates the possibility of measuring an alternate/parallel circuit path.
3. When checking for closed contacts and continuity use the lowest scale (Usually 200 ohms). Then try higher scales. This scale is 0 to 200 ohms so if the device you are measuring is 300 ohms this scale would show an open circuit which it is not, you are just measuring outside the scale's dynamic range.

There is a good STICKY at the start of this forum about it's use.
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