Test Upper Thermostat Electric Water Heater

Connect the multimeter pin ends on point 1 2 as shown in the picture below. Testing the water heater thermostat involves the checking of the heating element also. When this water is hot enough it shuts the upper element off.

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If you want to test a thermostat on an electric water heater you will also need to check the heating element.

Test upper thermostat electric water heater. The reading on the multimeter should be zero. Before you proceed further with the process of testing the heater thermostat take a screwdriver and the multimeter. Check the power supply of the thermostat. Before handling anything on the thermostat use a multimeter to confirm the power is off to the water heater.

The upper thermostat has two functions. First it allows the upper element to heat the water in the top of the tank. If the opposite thing happens that means your thermostat has defected. This is important especially as open and grounded heating elements result in inaccurate tests.

To look for faults you will need to use a screwdriver. Leave the upper thermostat in the lowest setting and test the lower thermostat. One should be sitting on the top of unit 1. Your water heater usually has two elements and two thermostats.

If the water is hot enough at appointed temperature the meter won t show reading. And when it comes to thermostats the device uses two of them generally. The structure of an electric water heater is pretty simple. Touch one probe of the multimeter to each terminal on the lower thermostat.

Start by checking the thermostat terminals for the supply of power. Using the multimeter connections touch the top to legs at the same time. If you get the reading of 240v on terminal 1 and terminal 3 then the power is on but if you get no readings then the power is off. If the water is cold the multimeter will point near zero.

Use the screwdriver to set the lower thermostat to the highest setting. However they do go bad and testing water heater thermostats is still required. While the other is found right on the bottom. The meter should read 0.

Test the water heater thermostat. You will also need to check the water heater thermostat with digital multimeter tools. If you have a voltage stick you can use that as well. In this case also check the current at the high limit switch.

The lower thermostat has only two terminals. To look at the faults in the upper thermostat you need to turn off the lower one.