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.
Gas hot water heater thermostat test.
Step 2 use a flathead screwdriver to remove the thermostat cover plate.
How to test water heater thermostat this case might happen for the defected thermostat.
When a lower heating element or thermostat fails the top thermostat and element will continue to heat water in the upper half of the tank but you will notice the hot water quickly runs out or is only lukewarm.
Not sure if this is your problem.
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When an upper heating element or thermostat fails the entire water heater stops producing hot water.
The upper thermostat controls both the upper and lower element.
However you will need to know how to test a water heater thermostat to find the faulty unit.
How to test and replace a water heater thermostat.
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.
But if the water is hot that becomes later becomes cold then you have a damaged lower thermostat.
Alternatively water is not heating at all.
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Step 1 turn the circuit breaker off to the hvac system.
This article deals with thermostats on electric water heaters.
When it goes bad you don t have any hot water at all.
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Water heater is not getting power.
There will be a slot to place the blade of the screwdriver between the faceplate and the main body of the thermostat.
Although most of the cases this scenario occurs for the power supply problems.
You know when your shower spits ice cubes instead of hot water that it s time to replace the thermostat for your water heater.
If you do not have a volt ohm meter you need to know how to bypass a thermostat to test it.
The upper thermostat is the primary one that contains the high limit switch and the lower thermostat is used to detect the change in the temperature of the water.
For thermostats on gas hot water heaters you will need to see the article gas water heater thermostats for more information.
If you turn the hot water tap and cold water runs out then the upper thermostat is damaged.
Check your heater s power.
Turn the upper thermostat to it s highest temperature and if checking a dual element heater the lower thermostat to it s lowest setting.
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.
Other than this the thermostat controls the current flowing from one thermostat to another thermostat or from the thermostat to the heater.