Thermador Induction Range Cooktop F8 + H/h: Automatic Time Limit

What F8 + H/h means

F8 together with an H or h on the induction side of Thermador Pro Harmony and Masterpiece MRI304DL ranges means a cooking zone ran continuously for a long time without any interaction and the automatic time limitation triggered, so the zones do not heat. It is a built-in safety limit rather than damage. Other generations use F8 differently.

Usual causes of F8 + H/h

Automatic time limitation

✓ A safe check worth trying

1. Switch the zones off. 2. Touch a control to clear the message. 3. Start cooking again. 4. If it triggers after only a short time, note how long the zone had run and call us. Keep an eye on how long the zone stays on.

! Why you should stop here

Normally no repair is needed.
Early triggering needs a technician's check.
A written quote comes first.

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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More Range codes

E2Thermador Range E2 on Legacy PDR/PRG Models, Light Code 01: Control Not Calibrated F6Missing Line-Cycle Signal: F6 on a Legacy Thermador 30-Inch Range E3E3 on an Older Thermador Pro-Harmony Range (Light Code 10): Open Oven Sensor F7Legacy Thermador ESC30/GSC30 Range F7: Stuck or Shorted Function Key E4Thermador Pro-Harmony Range Showing E4 and Light Code 12: Shorted Oven Sensor F8Older Thermador 30-Inch Range Cancels Cooking with F8 (Supervisory Error) E5Legacy Pro-Harmony Thermador Range E5 Means Potentiometer Failure (Light Code 21) F9Legacy Thermador ESC30/GSC30 Range with F9: Door Latch Supervisory Error

F8 + H/hF8 + H/h questions

Is the cooktop broken?

No. The manufacturer text describes a time limit that ends long unattended cooking. Resetting and restarting is the normal response. No repair is expected. Nothing is wrong with the glass.

What do the H and h mean?

They appear together with F8 for the time limit, per the manufacturer text. We do not read more into them than the source says. We read them as the source does.

When should I call you?

If the limit triggers during short cooking, or the zones stay dead after a reset, call us so we can check the cooktop. Include how long the zone had been on.