How to fix the water heater; is not working.

JUAN MANUE Z
by JUAN MANUE Z
Is a water heater a.o.smith , model ELJF 40. IS LOCATED UNDER THE AIR CONDITIONING.
YESTERDAY THE TEMP. WAS SO HOT THAT YOU CAN VOT TOUCHED, AND TODAY IS COLD. TO ME COULD BE THE THERMOSTAT, THAT CONTROL RESISTENECES AND VALVES
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