Test Upper Thermostat Electric Water Heater

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.

Test upper thermostat electric water heater.

If you want to test a thermostat on an electric water heater you will also need to check the heating element. Using the multimeter connections touch the top to legs at the same time. In this case also check the current at the high limit switch. When this water is hot enough it shuts the upper element off.

Before you proceed further with the process of testing the heater thermostat take a screwdriver and the multimeter. The structure of an electric water heater is pretty simple. Test the water heater thermostat. If the water is hot enough at appointed temperature the meter won t show reading.

Use the screwdriver to set the lower thermostat to the highest setting. If the water is cold the multimeter will point near zero. Testing the water heater thermostat involves the checking of the heating element also. One should be sitting on the top of unit 1.

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. To look at the faults in the upper thermostat you need to turn off the lower one. You will also need to check the water heater thermostat with digital multimeter tools.

The meter should read 0. To look for faults you will need to use a screwdriver. The lower thermostat has only two terminals. If the opposite thing happens that means your thermostat has defected.

First it allows the upper element to heat the water in the top of the tank. Connect the multimeter pin ends on point 1 2 as shown in the picture below. If you have a voltage stick you can use that as well. Start by checking the thermostat terminals for the supply of power.

Your water heater usually has two elements and two thermostats. This is important especially as open and grounded heating elements result in inaccurate tests. However they do go bad and testing water heater thermostats is still required. While the other is found right on the bottom.

Leave the upper thermostat in the lowest setting and test the lower thermostat. Check the power supply of the thermostat.