Viking Designer Cooktop Code Fd: LED On/Off Test Error

What Fd means

On Viking Designer DETU series touch-control radiant cooktops, Fd is an LED on/off test error. The control checks its indicator lights as part of its self-test, and Fd means that check did not come out right. The elements all go cold, and the timer display keeps showing the code. The cooktop may be fine otherwise, but it will not heat until the check passes.

Common causes of Fd

Indicator LED circuit not responding to the test
Loose connector at the display board
Control board problem

✓ One safe check you can try

1. Turn all controls off and wait for the glass to cool. 2. Switch the breaker off for a full minute and restore power. 3. Watch whether the indicator lights come on normally. 4. Touch the on key once. 5. If Fd returns, call us.

! Why to stop there

The LED circuit sits under the glass
A self-test failure needs the control opened to read
Replacing the whole control is not always required

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.

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Other Cooktop codes

10Viking Induction Cooktop Code 10: wrong terminal connected, supply over 400 volts Residual HeatViking Induction Cooktop Message "Residual Heat": zone still above 60 C Er31Viking Induction Cooktop Code Er31: Wrong Interface Board Fitted F5Viking Designer Cooktop Code F5: Communication Error That Stops All Heat FAViking Designer Cooktop Code FA: Key Error Shuts Off the Elements FbViking Designer Cooktop Code Fb: Keyboard Error With a Small b FCViking Designer Cooktop Code FC: Key Error With a Capital C FcViking Designer Cooktop Code Fc: Over Temperature With a Small c

FdFd questions

What is an LED on/off test?

The control turns its indicator lights on and off during a self-test and checks the result. If the circuit does not answer, it shows Fd and stops heating. The control runs this check on its own, and the result is what you see.

Will the cooktop work again after a reset?

If the test passes the second time, yes. If Fd returns, a part in the LED circuit or the control needs service, but only a technician can say whether a part is needed.

What will it cost?

The price depends on the part. We quote it in writing before work and back the repair with a 30-day workmanship warranty. You see the number before we begin.