- Boiler scaled up
- Inlet valve leaking (valve not tight, limescale fragments in seal, etc.)
- Foam in the boiler housing, especially after descaling
- Convection Steam Oven (CSO) has error code E69
- What error 69, E69, and F21 means
- CSO with F21 message
- CSO F21/E69 error
Steps to Verify Issue:
If descaling was carried out recently:
- Water system pumping off water at least three times within 2 hours
- Use of non-recommended descaling solution can cause foaming
For error E69 and message F21 on a Wolf Convection Steam Oven, no troubleshooting advice is available. Contact Factory Certified Service to schedule an appointment for repair.
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