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How To Test Water Heater Thermostat. 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. You can test them with the power off using an ohmmeter to measure resistance or with the power on using a voltmeter to measure voltage. Use the screwdriver to reduce the temperature of the lower thermostat and take it to the minimum possible value. If the hot water heater is not working, one of the thermostats may be bad.
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Check your heater’s power connecting point. B) set a voltmeter to the 300 volts scale. So at first make sure your power cord is okay. 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. You know when your shower spits ice cubes instead of hot water that it�s time to replace the thermostat for your water heater. 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.
You know when your shower spits ice cubes instead of hot water that it�s time to replace the thermostat for your water heater.
The electrical power that heats the water can cause serious injury or even death. Simply mark the current temperature setting on the water heater, adjust the temperature up or down, then wait. The easiest way to test a water heater thermostat is the ‘set and observe’ method. The meter reading should be the input voltage of the heater (see rating plate of the water heater). Before you plunge in to check the thermostat, you need to keep in mind about checking the heating element as well. You can test them with the power off using an ohmmeter to measure resistance or with the power on using a voltmeter to measure voltage.
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