Thermador Refrigerator HI Alarm on Under-Counter Units

What HI means

HI appears on the LED display of an under-counter refrigerator, wine or combination unit, such as the T24UR, T24UW or T24UC series. It is a high-temperature alarm: the inside is warmer than it should be. The guide names frequent opening, covered ventilation, a large amount of warm product, a hot room and a door or drawer gasket that is not sealing as reasons.

Usual causes of HI

Door or drawer opened often
Ventilation openings covered
A large load of warm product added at once
A hot room around the unit
A gasket that does not seal

✓ A safe check worth trying

1. Keep the door or drawer closed so the unit can recover. 2. Clear anything blocking the ventilation openings. 3. Let newly added warm items cool, and avoid adding a large batch at once. 4. Look along the gasket for gaps or folds. 5. Press ALARM once to deactivate the tone. Call us if HI returns.

! Why you should stop here

If HI keeps coming back with clear vents and a good gasket, the cooling system needs testing.
A unit that stays warm puts food or wine at risk, so we do not wait long on a repeat alarm.

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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HIHI questions

What does HI mean on my under-counter unit?

It is the high-temperature alarm. The inside has gotten warmer than the set point, and the guide lists common reasons such as covered vents, a warm load, a hot room or a gasket that is not sealing.

How do I turn the alarm off?

Press ALARM once to deactivate it, as the guide says. That only silences the warning, so you should still clear the vents and check the gasket so the temperature can come back down.

Does the room matter?

Yes. A hot room, or a unit built in with its ventilation openings covered, makes it harder to hold temperature. Make sure air can move freely around the front, and tell us if the room is unusually warm.