Leave the upper thermostat in the lowest setting and test the lower thermostat.
Test upper thermostat electric water heater.
Use the screwdriver to set the lower thermostat to the highest setting.
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.
When this water is hot enough it shuts the upper element off.
Touch one probe of the multimeter to each terminal on the lower thermostat.
However they do go bad and testing water heater thermostats is still required.
Testing the water heater thermostat involves the checking of the heating element also.
The lower thermostat has only two terminals.
You will also need to check the water heater thermostat with digital multimeter tools.
Test the water heater thermostat.
If the opposite thing happens that means your thermostat has defected.
While the other is found right on the bottom.
Before handling anything on the thermostat use a multimeter to confirm the power is off to the water heater.
Check the power supply of the thermostat.
Using the multimeter connections touch the top to legs at the same time.
To look at the faults in the upper thermostat you need to turn off the lower one.
This is important especially as open and grounded heating elements result in inaccurate tests.
If the water is hot enough at appointed temperature the meter won t show reading.
The reading on the multimeter should be zero.
One should be sitting on the top of unit 1.
The upper thermostat has two functions.
If the water is cold the multimeter will point near zero.
Start by checking the thermostat terminals for the supply of power.
If you want to test a thermostat on an electric water heater you will also need to check the heating element.
Before you proceed further with the process of testing the heater thermostat take a screwdriver and the multimeter.
The meter should read 0.
Your water heater usually has two elements and two thermostats.
If you have a voltage stick you can use that as well.
To look for faults you will need to use a screwdriver.
The structure of an electric water heater is pretty simple.
Connect the multimeter pin ends on point 1 2 as shown in the picture below.
