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Error codes are considered start-point for troubleshoot. Error code 24 is malfunction of operational switch: press max or min button on PC board to reset, -or- replace PC board. Max-min button is sometimes located above dip switches, and can be 1 button that is rotated with screwdriver or 2 separate buttons. Look at wiring diagram in manual that came with product.
Lower element can be burned out and still read 230V across screws
1) We know thermostats are working because elements test 230V. 2) We know upper element is working because tank has some hot water. If upper element is burned out, tank will have no hot water. http://waterheatertimer.org/How-it-works.html
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