How to Test a Heating Element

Step-by-Step Guide

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   Step 1: Assuming that a visual inspection of the element has been done or isn’t possible.

   Measure the resistance of the heating element by connecting the multimeter leads across the terminals of the heating element. ,,,, You will need to disconnect it from the power source, in most cases it will mean locating your breaker panel and turning the breaker off. , Locate the water valve at the bottom of the water heater.
   
   Attach a garden hose to it securely, the open the valve.
   
   You will notice a relief valve near the top of the water heater, you can flip the handle up to open it.
   
   By doing this it will allow air into the tank causing the water to flow out more quickly. ,,, Remove the heating element, you can now check the element as shown above.
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   Step 2: First we need to know what the resistance of the element should be this can be calculated using known values:

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   Step 3: R = (V x V) / P (An example calculation is shown in the tips section)

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   Step 4: Now we Know what resistance we are looking for we can check the element.

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   Step 5: Set the multimeter to the resistance setting with an appropriate measuring scale selected.

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   Step 6: With the power off

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   Step 7: Unplugged or by other means disconnected from the mains.

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   Step 8: If the reading is the same or very close to that of the calculated value then the element is OK and the fault lies elsewhere.

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   Step 9: If the reading is a lot higher than the calculated value the element is failing and won't be heating fully.

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    Step 10: If the reading is a lot lower than the calculated value the element is failing and will be heating to much or not at all if part of the element has shorted or exploded.

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    Step 11: If you are checking the heating element in a hot water heater in a house.

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    Step 12: Next you will need to drain the water from the water heater.

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    Step 13: Once the tank is empty

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    Step 14: you can now remove the cover over the heating element.

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    Step 15: Now remove the electrical wires going to the heating element.

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    Step 16: Next you will need a socket or a wrench

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    Step 17: if you have access to get to it.

Detailed Guide

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