Runaway Temperature Alarm F2 on a Legacy Thermador ESC30/GSC30 Range

What F2 means

Seeing F2 on an older ESC30 or GSC30 30-inch range means the oven supervisor believes the cavity temperature ran away during cooking or cleaning and has raised an alarm. The usual cause in the legacy document is the oven sensor or a poor contact in its connector, not necessarily true overheating. Newer Thermador units use F2 differently.

Usual causes of F2

Bad oven sensor
Poor contact at the molex connector
Sensor leg shorted to ground or to a supply phase
Worn molex spring contacts

✓ A safe check worth trying

1. Turn the oven off and open the door slightly to help it cool. 2. Wait until the cavity is fully cool. 3. Switch the range breaker off and back on. 4. If F2 returns, leave the oven off and call us to test the sensor; do not reach behind the range yourself.

! Why you should stop here

The source calls for a sensor resistance check against 1050 ohms at 75 F.
Checking each leg to ground needs a meter.
We tell you what the readings show and quote in writing before a part is ordered.

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.

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F2F2 questions

What is the 1050-ohm number about?

The legacy document says the oven sensor should measure 1050 ohms at 75 F, within 10 percent. Readings far off point to a bad sensor, which only a technician should measure.

Why would the connector matter?

A weak contact in the molex connector can mimic a bad sensor. The document specifically lists the spring contacts as a check, along with each sensor leg.

Can F2 appear when the oven is not that hot?

Yes, because the alarm depends on what the sensor reports. A bad reading can trigger it, so we test before assuming real overheating. Tell us the code and when it appeared.