The article on how to adjust a water heater thermostat discusses this topic in detail.
Thermostat water heater electric.
Electric water heater thermostats are a fairly simple devices that can fail from time to time.
For the sake of safety use a voltage meter to.
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Do not raise the water temperature to generate more hot water.
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.
Always disconnect the power or shut off the breaker before doing any work on a water heater.
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.
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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.
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Electric water heater thermostat replacement step 1.
If the hot water heater is not working one of the thermostats may be bad.
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Testing is the only option if you want to determine whether or not one or both of them has failed.
The electric water heater thermostats have a dial on them that you use to adjust the water temperature.
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Electric water heaters have one or two elements and each is controlled by a thermostat.
The factory settings will at a safe level.
Turn off the power.
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.
An electric water heater has a thermostat like a tankless water heater.
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Luckily testing and fixing a faulty thermostat requires a few tools such as a multimeter and a pair of screwdrivers.
See testing electric water heater elements for more information.
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