For the sake of safety use a voltage meter to.
Thermostat water heater electric.
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If the thermostats are okay you need to test the water heater elements.
Usually when the upper thermostat goes bad you will have no hot water at all while a bad lower thermostat makes itself known when there is only a small amount of hot water before the tap water goes cold.
Turn off the power.
You can test them with the power off using an ohmmeter to measure resistance or with the power on using a voltmeter to measure voltage.
You don t even need any special skills to solve this problem.
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Luckily testing and fixing a faulty thermostat requires a few tools such as a multimeter and a pair of screwdrivers.
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The factory settings will at a safe level.
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The electric water heater thermostats have a dial on them that you use to adjust the water temperature.
An electric water heater has a thermostat like a tankless water heater.
The article on how to adjust a water heater thermostat discusses this topic in detail.
Electric water heaters have one or two elements and each is controlled by a thermostat.
Testing is the only option if you want to determine whether or not one or both of them has failed.
Electric water heater thermostats are a fairly simple devices that can fail from time to time.
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Always disconnect the power or shut off the breaker before doing any work on a water heater.
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Do not raise the water temperature to generate more hot water.
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You just need to follow these easy steps.
To change thermostats you will need to remove the access panel and safety cover do this for both upper and lower access panels on dual element units.
See testing electric water heater elements for more information.
An electric hot water heater has two thermostats controlling two separate heating elements one in the upper half of the tank one in the lower half.
Electric water heater thermostat replacement step 1.