There will be a slot to place the blade of the screwdriver between the faceplate and the main body of the thermostat.
Gas hot water heater thermostat test.
Turn the upper thermostat to it s highest temperature and if checking a dual element heater the lower thermostat to it s lowest setting.
You know when your shower spits ice cubes instead of hot water that it s time to replace the thermostat for your water heater.
Step 1 turn the circuit breaker off to the hvac system.
This article deals with thermostats on electric water heaters.
For thermostats on gas hot water heaters you will need to see the article gas water heater thermostats for more information.
When it goes bad you don t have any hot water at all.
Although most of the cases this scenario occurs for the power supply problems.
As soon as you complete this task you can fix it.
Other than this the thermostat controls the current flowing from one thermostat to another thermostat or from the thermostat to the heater.
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When checking the thermostat in a single element water heater or the upper thermostat in a dual element water heater the process is the same.
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However you will need to know how to test a water heater thermostat to find the faulty unit.
Step 2 use a flathead screwdriver to remove the thermostat cover plate.
I think we can all agree that waking up to take a shower in the middle of winter only to find out that all the water is cold is not the best thing to happen to anyone.
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An electric hot water heater has two thermostats controlling two separate heating elements one in the upper half of the tank one in the lower half.
When an upper heating element or thermostat fails the entire water heater stops producing hot water.
Check your heater s power.
How to test water heater thermostat this case might happen for the defected thermostat.
Alternatively water is not heating at all.
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If you do not have a volt ohm meter you need to know how to bypass a thermostat to test it.
Water heater is not getting power.
The upper thermostat controls both the upper and lower element.
So at first make sure your power cord is okay.
If you turn the hot water tap and cold water runs out then the upper thermostat is damaged.
How to test and replace a water heater thermostat.
Usually when the upper thermostat goes bad you will have no hot water at all while a bad lower thermostat makes itself known when there is only a small amount of hot water before the tap water goes cold.
Not sure if this is your problem.