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