JennAir Radiant Cooktop Code F40: Touchpad, Power Board or Wiring

What F40 means

F40 on JennAir electric radiant and touch-control cooktops indicates there may be a problem with the user interface (touchpad), the cooktop power control board, or the wiring between them. The touchpad and power board work as a pair, and when their conversation fails, the cooktop may ignore your touches or show F40 and refuse to heat. Cookware and cleaning will not change this code.

Common causes of F40

The touchpad (user interface) is failing
The cooktop power control board has failed
Wiring between the touchpad and the power board is damaged or loose
A power surge that damaged either board

✓ One safe check you can try

1. Turn off all controls and clean the glass so nothing is on the touch area. 2. Switch the cooktop's breaker off for one minute, then back on. 3. Test a single element on a low setting. 4. If F40 comes back, leave the cooktop off. 5. Call us and give the model number.

! Why to stop there

The power control board handles high current under the glass.
Telling a bad touchpad from a bad power board needs testing with power connected.
Ordering both boards to be safe adds a large, unnecessary cost.

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

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? FC E4JennAir Induction Cooktop Code FC E4: Harness Between Touchpad and Module FC LFJennAir Radiant Cooktop Code FC LF: Left Front Element or Its Wiring FC LRJennAir Radiant Cooktop Message "FC LR": Left Front Hotplate or Wiring FC RFJennAir Radiant Cooktop Code FC RF: Right Front Element or Its Wiring

F40F40 questions

What parts does F40 involve?

The touchpad, the cooktop power control board and the wiring between them. The code does not say which one, so a technician tests each one before recommending a part.

Can I replace the touchpad myself?

We do not suggest it. The touchpad connects to a power board and live wiring, and buying the wrong part is common when the cause is not known.

What does your visit cost?

You get a written price before any work starts. We test first, explain the result in plain words and back the repair with a 30-day workmanship warranty.