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