Bosch Microwave ER11: A Control Key Is Jammed

What ER11 means

The microwave beeps or shows ER11 when you try to start, as though a key were held down. That is exactly what the control sees. A button is stuck, either with grease and sticky residue under it or because the pad underneath has worn or been damaged. Until that key releases, the control will not accept normal commands, which is why the oven seems ignored.

Common causes of ER11

Grease or food residue holding a key down
Worn membrane under the keypad
Physical damage to one of the buttons

✓ One safe check you can try

1. Unplug the microwave. 2. Dampen a soft cloth lightly with water, never dripping. 3. Wipe the control panel, going around every key and its edges. 4. Dry with a clean cloth, wait a few minutes, plug in and try again. If ER11 stays, call us.

! Why to stop there

Soaking the panel pushes liquid under the keys, which can ruin the board behind them.
Prying at a stuck key can tear the membrane that is otherwise repairable.
A worn pad can look cleaned but still fail, and only a replacement fixes it.

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.

→Same appliance

Other Microwave codes

E1Bosch Microwave E1: Thermistor Circuit Reads Open E4Bosch Microwave E4: The Thermistor Circuit Reads Shorted E-04Bosch Microwave E-04: Over-the-Range Humidity Sensor Not Reporting E-11Bosch Microwave E-11: Over-the-Range Key Read as Held for a Minute E3Bosch Microwave E3: Door Will Not Latch or Release Properly E11Bosch Microwave E11: Moisture Detected at the Control Panel E17Bosch Microwave E17: The Fast Preheat Did Not Finish ER1Bosch Microwave ER1: Convection Temperature Sensor Failing

ER11ER11 questions

Can I clean a stuck key myself?

Yes, gently, with the microwave unplugged and a barely damp cloth. Avoid sprays and abrasives. If cleaning does not free the key, the membrane may be worn and we can look at it.

Why did a key stick in the first place?

Kitchen grease and sticky residue build up around buttons over time, especially on microwaves mounted near a cooktop. Regular light wiping with a barely damp cloth helps keep every key free.

Is a keypad repair expensive?

It depends on the part, so we do not guess. We inspect, give a written price before any work, and cover the repair with a 30-day warranty.