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Testing Hot Water Heater Thermostat
Testing Hot Water Heater Thermostat. It is because this will determine whether your thermostat requires. If it has, press it.

If it has, press it. The fan should not be working. Check if the red high limit reset button has tripped.
Thereafter, Twist R And Y Wires Together And Turn The Hvac Breaker Back On.
Check if the red high limit reset button has tripped. Now, run the same test on the lower portion thermostat. You can do this by using your screwdriver or using the digital controls, depending on your water heater.
Remove The Outside Access Covers.
The last step of how to check thermostat on water heater is to check the thermostat with a multimeter. It is because this will determine whether your thermostat requires. Then, touch the other probe to each of the thermostat terminals, and both heating element terminals.
The Upper Thermostat Will Have A Reset Button.
Set your thermostat to read voltage. Confirm power is off to the water heater. Test the thermostat using an analog or digital multimeter.
The Multimeter Will Indicate, No Voltage Or “Zero” At All Times.
Set the multimeter dial to the lowest ohm of resistance. Test the electric water heater thermostats with a multimeter. If it has, press it.
The Fan Should Not Be Working.
Use a multimeter to test for continuity between 2 thermostat terminals. Touch one meter lead to the common terminal and the second. The basic part of checking the thermostat of your water heater is to check for continuity.
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