Dual Element Burner on glasstop range - inner element cycles off too long at 20-25 seconds

Could be either, but test the continuity of the heating elements with a multimeter first.

Ohm out the burner element for continuity if is in fact electric. The element could be burned through

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There are 2 likely causes. It is more likely that the element is open circuited and needs replacing. The hotplate controller could also be faulty. The circuit needs to be tested to determine the faulty part.

Disconnect power to range. If you have an ohm meter, you can check the burner coils for continuity from the wires at the switch. If not, open oven door, remove screws holding top. Lift up top and remove screws holding the set of burners in question and visually inspect the inner coil for a break in the burner coil.

The elements DO BURN OUT. Replace it.

Often you can see evidence of a hot spot on the element where the final failure occured, but not always.

It is the burner control (behind the knob). The triac in the control has failed. $50 item, 10 minute change. Just make note which wire goes to which terminal.

I doubt that it is the control board, as the board has little to do with the stove top, but rather controls the display and the oven temperature/feedback monitoring.

Hope this helps.

If the burner is scorched or pitted, go ahead and replace it. New burners can cost anywhere from $10 to $40. Otherwise, check the burner's electrical connections to make sure there is solid contact. Jiggle the burner in its socket. If it is loose, then remove the burner—most just pull out of the electrical socket, although some are mounted with a screw. (Always unplug the range before removing a burner.) Slightly spread the two terminals apart for a tighter connection. If it still doesn't work, then replace the faulty burner with a functioning burner of the same size. If that burner works, then replace the bad burner with a new one. If it doesn't, then inspect the electrical socket for damage. If it's charred, replace the socket. To do so, remove the screws that secure the socket to the range and then unscrew the range wires. Attach the wire connections of the new socket to the range wires and reassemble the burner.

yea sounds like an issue for sure, nut not with the element but hte switches instead, theres a short in one or the other( most likely the dual switch) i wouls reccomend replacing both the switches, the elemenst should be fine.

its been my experience that the dual burner switch is far more likely the culprit, unless you can physiclaly see the outer ring is broken( visual inspection works wonders. as far as trying to ohm out i generally look at theelemnet itself (4 wires lead to the elemnt you can trace 1 to the outer portion of element, and 1 to the inner portion.WITH POWER OFF Iswithc those 2 wires and the restore power try element ad watch for outer ring to work inner ring no good. now i know its the switch not sending power. reset wires and order new switch