Thermador ESC30/GSC30 Range F1: Supervisory Relay Enable Shorted

What F1 means

When a legacy 30-inch ESC30 or GSC30 range (electric or gas) displays F1, its safety supervisor has found a bake or broil relay stuck closed, which means an element could be getting power it should not. Pressing Cancel may clear the display, but if the cause is still present, F1 returns after 16 seconds. Newer Thermador ovens use F1 differently.

Usual causes of F1

Bake or broil relay stuck closed
Relay board failing

✓ A safe check worth trying

1. Press Cancel and see whether the display clears. 2. If F1 returns in about 16 seconds, switch the oven off at the control. 3. Turn off the range breaker and leave it off until we arrive. 4. Do not keep trying to bake or broil in the meantime.

! Why you should stop here

A relay stuck closed can keep an element energized.
The source's remedy is a relay board replacement, which is technician work.
We quote in writing first, with parts availability checked by model number.

Taking off a panel yourself does not by default void a manufacturer warranty, yet it can lead to accidental damage, and some manufacturers attach their own service terms. Read your warranty paperwork, or ask us, before you decide.

→Same appliance

More Range codes

E5Legacy Pro-Harmony Thermador Range E5 Means Potentiometer Failure (Light Code 21) F1Legacy RDF/REF 30-Inch Range F1: Stuck Buttons or Latch Switch E6Thermador PDR/PRG Range E6, Blue Lights 3-then-2: Over Temperature While Cooking F3Legacy RDF/REF 30-Inch Range F3: Open or Shorted Oven Sensor E7Cleaning Cycle Stopped by E7 on a Legacy Thermador Pro-Harmony Range (Code 23) E7010Thermador Induction Range Cooktop E7010: Wi-Fi or Hood Connection Lost E9Legacy Thermador Range E9: No Cooling Fans, Blue-Light Code 43 E9000 / E9010Thermador Induction Range Cooktop E9000 / E9010: Supply Voltage Out of Range

F1F1 questions

Why does F1 come back after 16 seconds?

Cancel only clears the message. If the relay is still stuck closed, the supervisor detects it again and shows F1 within about 16 seconds. That repeat is the clue we look for.

Is it safe to leave the breaker on?

Because a relay may be stuck closed, switching the breaker off is the cautious choice until a technician has checked the range and told you what is happening.

Is F1 here the same as F1 on the RDF range?

No. The RDF and REF ranges use F1 for stuck buttons or a stuck latch switch. Check your model number before comparing the two. The two codes are unrelated.