JennAir Induction Cooktop Code E_21: Wait While the Electronics Cool Down

What E_21 means

On JennAir induction cooktops, E_21 shows that the cooktop is too hot. The control panel has switched off because of excessively high temperatures, and the internal temperature of the electronic parts is too high. The only instruction is to wait for the cooktop to cool down before you use it again. Zones will not run until it has. The display stays on the code until the temperature drops.

Common causes of E_21

Electronics beneath the glass reached too high a temperature
Long cooking at high power without a break
Restricted airflow around the cooktop
A sensor that misreads the internal temperature

✓ One safe check you can try

1. Turn all zones off. 2. Remove pans from the cooktop. 3. Let the cooktop cool for at least 20 to 30 minutes. 4. Check that cabinet vents and the space below are clear. 5. Restart on a lower power level. If E_21 shows on a cold cooktop, call us.

! Why to stop there

Forcing a restart while hot can keep the control in shutdown.
Stuffing the cabinet below makes overheating more likely.
A cool cooktop that shows E_21 needs a sensor test with the power connected.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other Cooktop codes

F58JennAir Radiant Cooktop Code F58: Same Board Family as F42 U uJennAir Induction Cooktop Symbol U u: Pot Not Detected or Not Suitable F60JennAir Radiant Cooktop Code F60: Touchpad or its wiring F61JennAir Radiant Cooktop Code F61: Control, Module, Wiring or Supply F63JennAir Radiant Cooktop Code F63: Touch control or power supply concern F64JennAir Radiant Cooktop Code F64: User interface, module or supply trouble FC E0JennAir Induction Cooktop Code FC E0: Supply, Wiring or Induction Module FC E1JennAir Induction Cooktop Code FC E1: Is It the Touchpad or Its Wiring?

E_21E_21 questions

What should I do first when E_21 appears?

Turn off all zones, remove pans and let the cooktop cool. Nothing else is asked for until it has cooled down, so patience is the whole fix.

Will E_21 return if I cook on boost?

It can, if the cooktop runs hot for long periods. Use a lower power level and make sure air can move around the unit and under the glass.

When does E_21 become a repair issue?

Call us if it appears on a cool cooktop or keeps coming back after a full cool-down. We then inspect it and give a written price before any work.