How to Test a Water Heater Thermostat
Ran out of hot water? Here's how to troubleshoot (and replace if necessary) the
controls and heating elements of most common residential 120, 208 and 240 volt
electric water heaters.
Protective metal access panels removed from both upper and lower access points,
revealing styrofoam thermal insulation blocks. Others use removable fiberglass pads.
1. With power off, remove the upper (and if provided lower) access panel(s).
Once the insulation has been removed, plastic shock protectors are visible.
Carefully fold any wires away from the protective cover. Lift the tab at the
top away from clip and remove to access terminals.
View with plastic shock protector removed.