If the reading is more than zero the thermostat will need to be replaced. A good thermostat should have a reading of 0 ohms.
Use a multimeter to test for continuity between 2 thermostat terminals. To test a water heater thermostat, start by turning off power at the breaker then remove cover plates and insulation. A water heater reset button that keeps tripping is also another sign of a bad thermostat. If you have no hot water at all, you most likely have a bad upper thermostat while hot water that runs out fast is a sign of a bad lower thermostat. With a tripped reset button, the water in the water heater will no longer be heated and as a result you will have no hot water in the house. If there was a power surge or the thermostat fails to turn off the heating element, the water temperature will increase past the thermostat setting all the way to the reset button rating (180 0 F) which will cause it to trip and turn off power to the heating element. Somethings you may think that the reason you have no hot water is because of a bad thermostat, but the reset button may have tripped, especially if there was a power surge. This is most likely caused by a bad thermostat, short heating element or loose wiring. In most water heaters, this is a red button that is also concealed by the cover plate.Ī water heater reset button which is also known as an emergency cut off (ECO) switch cuts off power to the water heater (by tripping) in the event of an unsafe condition. The upper thermostat is usually connected to the water heater reset button. It does that relative the water temperature inside the water heater. The function of a water heater thermostat is to turn the power to the heating element on and off. Both thermostats are concealed using a metal cover plate secured to the water heater using one or two screws. How Do I Troubleshoot My Electric Water Heater Thermostat?Īn electric thermostat will most likely have 2 thermostats, an upper and a lower thermostat.
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