Bertazzoni 30-Inch Combi-Steam Oven Descale Light: Steady Means Due, Flashing Means Overdue

What Descale light (steady / flashing) means

On Bertazzoni 30-inch combi-steam ovens, including the MAST30CSEX, PROF30CSEX, MASCS30X and PROCS30X, the Descale light tells you about scale in the steam generator. A steady light means descaling is needed. A flashing light means it is overdue. If it is left alone, the oven eventually locks and shows CAL blinking, so run the descaling program soon after the light first comes on.

Common causes of Descale light (steady / flashing)

Normal scale build-up from regular steam cooking
Hard water speeding up the reminder
Descaling skipped after the light first came on
A previous descale cycle that did not finish

✓ One safe check you can try

1. Empty and rinse the water tank. 2. Prepare the descaling solution in the amount the oven's instructions require. 3. Start the descaling program from the menu and leave the oven alone until it ends. 4. Rinse the tank and run clear water through as instructed. 5. If the light stays on after a full cycle, call us.

! Why to stop there

Descaling with the wrong product can leave deposits in the steam path.
A flashing light that is ignored ends with the oven blocked.
A light that stays on after a good cycle suggests a counter or sensor problem that needs testing.

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 Steam Oven codes

CAL (blinking)Bertazzoni 30-Inch Combi-Steam Oven Code CAL (Blinking): Descaling Overdue, Oven Blocked DEP / EMPBertazzoni 30-Inch Combi-Steam Oven Code DEP or EMP: Tank Must Be Emptied -L0-Bertazzoni 30-Inch Combi-Steam Oven Code -L0-: Water Tank Nearly Empty PUMPBertazzoni 30-Inch Combi-Steam Oven Code PUMP: Water Returning to the Tank rESBertazzoni 30-Inch Combi-Steam Oven Code rES: Water Tank Not Seated SAFEBertazzoni 30-Inch Combi-Steam Oven Code SAFE: Child Lock Active VAPBertazzoni 30-Inch Combi-Steam Oven Code VAP: Steam Reduction Running

Descale light (steady / flashing)Descale light (steady / flashing) questions

What is the difference between steady and flashing?

Steady means descaling is needed, flashing means it is overdue. You can still cook for a while on flashing, but the next stage is a locked oven with CAL blinking.

How often should I descale?

The oven decides by counting use and water hardness, so follow the light instead of a calendar. In hard-water areas it can come on after fewer cycles than you would guess.

The light stays on after descaling. Why?

The counter may not have registered the finished cycle, or scale remains. Run the program once more with the correct solution and a fully filled tank. If it persists, a technician can check the system.