Ao smith high limit switch
1st generation apple pencil charging
the air pressure switch and/or. the vent temperature limit switch (these two switches are wired. together in a “series” circuit). 1 Check/clean intake air screen on the base ring of the. water heater. 2 Check/clean the dilution air screen on the blower. assembly. 3 Check/clean the flame arrestor - see the service note. below.
When the water temperature in your water heater exceeds 180°, the red reset button (also known as the high-limit switch) trips. This tripping protects you from getting scalded or burned when using hot water in your home. OK, but then what's causing the water in your water heater to get so hot? The most likely cause is a bad thermostat.