Wolf Convection Steam Oven Message Boiler scaled up: Descale required

What Boiler scaled up means

On Wolf convection steam ovens, such as the CSO30TM/S/TH or CSO3050TM/S/T, the message Boiler scaled up, please descale tells you the boiler has reached its maximum operating hours and needs descaling. It can also follow the water-system errors E66, E68, E70 and E72. Steam features may be limited until the descaling program is done and the message is cleared. The oven is otherwise usable.

Common causes of Boiler scaled up

Boiler has run its maximum number of operating hours since the last descale
Mineral buildup from hard water in the boiler
Water-system error history (E66, E68, E70, E72) leading to the prompt

✓ One safe check you can try

1. Empty and rinse the water tank, then refill it with fresh water. 2. Run the oven's descaling program as described in your use and care guide, using the recommended descaler. 3. Rinse the tank and run the rinse cycle. 4. If the message returns right after descaling, or E66, E68, E70 or E72 appears, call us.

! Why to stop there

Skipped or partly completed descaling can leave scale that keeps the message coming back.
If a water-system error caused the prompt, descaling alone will not solve the real problem.
We check the water path and boiler, then give the price in writing before any work.
Our repair is covered by a 30-day workmanship warranty.

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

U1Wolf CSO Steam Oven Code U1: L2 supply problem U2Wolf CSO Steam Oven Code U2: mains undervoltage E26Wolf Convection Steam Oven Code E26: Climate sensor problem E42Wolf Convection Steam Oven Code E42: Water temperature sensor error E87Wolf 24-Inch E Series Code E87: Exhaust slide valve jammed or shorted E87Wolf Convection Steam Oven Code E87: Exhaust slide valve stuck E26Wolf 24-inch E Series Code E26: Break or loose contact in climate sensor, or blocked duct F0Wolf Convection Steam Oven Code F0: Core temperature probe sensor problem

Boiler scaled upBoiler scaled up questions

Is this an error or a reminder?

It is a maintenance message tied to boiler operating hours, so it is closer to a reminder than a breakdown. Ignoring it can limit steam cooking.

Why do E66, E68, E70 or E72 matter?

Those water-system errors can also lead to this prompt. If any of them appear with it, descaling may not be enough and the water system should be checked.

How can I slow the buildup?

Using fresh, softer water in the tank helps reduce scale. Our visit can also check the boiler if scale returns quickly. We can also advise on tank water.