Sustained High Voltage and Bosch Washer dr:21

What dr:21 means

Where dr:09 is a momentary spike, dr:21 means the inverter found the incoming voltage staying too high for a sustained period. Bosch blames a weak power supply, and tells technicians to wait and then check the line voltage. Prolonged high voltage usually signals a wiring issue at the home and not a passing event. The washer protects itself by stopping.

Common causes of dr:21

Prolonged high voltage at the home
Neutral wire problem lifting the voltage
Irregular supply from the utility side

✓ One safe check you can try

1. Switch the washer off and wait a few minutes before using it again. 2. Take note of whether lights brighten and dim together, or whether other electronics have failed early. 3. Share these observations with an electrician. Measuring the supply is their job, and these signs accompany the kind of problem this code records.

! Why to stop there

A neutral problem can put too much voltage on every appliance in the home, not just the washer.
Testing voltage with a meter without training is a shock hazard.
Replacing washer parts will not stop a high-voltage supply from damaging the next ones.

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 Washer codes

dr:15Bosch Washer dr:15 Gives an Early Warning From the Power Limiter dr:19Bosch Washer dr:19 Shows That the Motor Phases Don't Match dr:20Bosch Washer dr:20 Signals a Shorted Inverter Output Stage dr:22Bosch Washer dr:22 Reports Failure of the Inverter's Own Temperature Sensor dr:02Bosch Washer dr:02 Indicates an Inverter Power Switch That Is Open dr:06Bosch Washer dr:06 and the Inverter's Temperature Protection dr:08A Bosch Washer With dr:08 Has a Drum Speed Sensor Problem dr:09Bosch Washer dr:09 Records a Short Voltage Spike Seen by the Inverter

dr:21dr:21 questions

Why wait before restarting?

Bosch's remedy begins with a wait, which lets the inverter clear the condition. If the supply is still high afterward, the code will return, and the wiring needs attention.

Could other appliances be affected?

Yes. A sustained overvoltage stresses anything plugged in. If other electronics have failed early or lights flicker, have the supply checked soon. It is a house issue more than a washer issue.

How is dr:21 different from dr:11?

dr:11 is voltage too low, and dr:21 is voltage too high for too long. Both send you to the house wiring first, because the appliance may be reacting correctly.