Verified from the manual · Updated October 2026
Bosch steam oven error codes
3 codes for Bosch wall ovens including the HSLP451UC Benchmark steam convection oven (Bosch publishes one error-code page for all ovens and microwaves; the HSLP451UC Use and Care manual troubleshooting table lists no display codes), transcribed from the official documentation with page references.
| Code | What it means | Likely cause | What to do | Service? |
|---|---|---|---|---|
| E11 | The touch keys are not operating properly. | May be due to condensation on the keypad. | Clean the control panel with a dry cloth. Disconnect the appliance from the power supply by switching off the fuse in the fuse box and switch it back on after 10 seconds. | Owner fix |
| E + number (display only) | A malfunction has occurred. | Not specified; the code identifies the malfunction for service. | Note any error codes shown on the display. Disconnect the appliance from the power supply by switching off the fuse in the fuse box and call Bosch Customer Support at 1-800-944-2904 for assistance or to book a service visit. | Call service |
| E + number (display and beeping) | A fault/error code. | Not specified. | Press any button to stop the beeping. Reset the oven if necessary. If the error code continues to show, turn the oven off and call Bosch Customer Support at 1-800-944-2904. | Call service |
Source: Bosch USA owner support, Oven & Microwave error codes.
Before you call Bosch
- Refill and re-seat the water tank, and straighten any inlet or drain hose you can reach.
- Run the descale program if the oven has one, with the manufacturer's descaler, not vinegar.
- Switch the oven off at the wall for a minute and back on. One power-cycle is in nearly every manual; repeated resets are not.
- If the same code returns, note it with the serial number and book service. Every sensor, probe, fan or board code above is listed by Bosch as a service call.
Maintenance that prevents the water codes
Regular descaling with the product your manual names prevents most of the scale-related faults above. Affiliate links, at no cost to you.
A general-purpose steam-oven descaler, for ovens whose manual allows a generic one (Anova says any descaling liquid works). Miele and Thermador name their own descalers; use those instead.
View on Amazon · ~$21
The tablets Miele's own descale program expects. Clears the F20 message on DGC combi-steam ovens.
View on Amazon · ~$22
A soft, non-abrasive cloth for drying the door and cavity after a steam cycle. Every manual we checked rules out scouring pads and abrasive cleaners.
View on Amazon · ~$9