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Testing electric water heater element11/19/2023 ![]() Thermostats have a built-in safety feature (the reset button), allowing them to cut off electrical power (tripping the power) in an emergency. You can also use a multimeter with an Auto-Range feature. If the device reads OL, the range value is too low. You can always reset the multimeter to a lower range later. If you are unsure about the water heater’s resistance rating, you can set the multimeter’s range value higher. Turn the multimeter dial to the Resistance Mode (marked ΩnS), and set the range according to the water heater thermostat’s Ohms rating. Plug the black male plug into the multimeter’s COM port, and insert the red plug into the Voltage port (marked VΩmA). If the device detects voltage, double-check the circuit breaker panel and retest.ĭo not proceed with testing hot water heater thermostat with the water heater powered on. Pro Tip: Use a non-contact voltage detector to check the electric current in the thermostats after removing the plastic insulating cover. Remove the insulation material and keep it safe. Use a flat-tip screwdriver to peel off the plastic insulating cover. Flip the cutout flap down or up and secure it with tape. Open the upper panel first before detaching the lower thermostat compartment.Įach thermostat will have a plastic insulating cover and a cutout flap on top. Use a screwdriver to loosen and remove the screws fastening the thermostat access panel covers. You can also try switching off the breakers one at a time until you know the water heater is turned off. If there are no labels, you might not have any choice but to turn off the entire circuit breaker panel. ![]() You should see a label alongside the breaker, depending on who installed the system. Switch off the breaker that connects to the water heater at the circuit breaker panel. Most electric water heaters do not have a manual power on/off switch because they have a dedicated electrical connection to a circuit breaker. Steps for Testing a Water Heater with a Multimeter Most units have slotted screws, requiring a flat-tipped screwdriver. You might want to check the manual for the fastener type securing the wires to the thermostat. You need this to double-check the water heater’s electrical power status before proceeding with the thermostat testing.Īnother indispensable tool is the screwdriver. Although not mandatory, I recommend getting a non-contact voltage detector (people call it a voltage stick).
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