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