How to Troubleshoot an ELECTRIC Water Heater

Steps

Heating element or Thermostat are the main reason for electric water heater failure

Shut off the power to the water heater from the breaker
remove the access panels to expose the element and thermostat
remove the insulation
remove the plastic cover that is covering the element and thermostat
verify the power is off using a volt stick
remove the wires to the upper element
resistance check using a voltmeter
one probe to each screw to test the resistance
if the meter is measuring no resistance, then the element is bad
if the upper element is good, repeat the steps to check the bottom element
testing a ground element set to OHMs using the voltmeter
use one probe to the screw and the other probe to the neutral side
should receive no resistance, if there is resistance then the grounded element is bad.

Chinese:

检查步骤：