Bosch Washer dr:09 Records a Short Voltage Spike Seen by the Inverter

What dr:09 means

dr:09 on a Vision washer records a short jump in the incoming voltage, detected by the inverter. Bosch blames a weak power supply and says to check the line voltage. A spike like that is typical when a heavy load drops off elsewhere in the home, or when power returns after a Houston storm. The washer often keeps working afterward.

Common causes of dr:09

Short voltage surge on the household circuit
Poor or aging house wiring
Loose or defective neutral producing swings

✓ One safe check you can try

1. Notice when dr:09 appears, for example at certain hours or just after the air conditioner or dryer shuts off. 2. See whether anything large is plugged into the same circuit. 3. Write down what you find. Measuring the supply itself is an electrician's job.

! Why to stop there

Opening the outlet box to check wiring is a shock risk.
Replacing the inverter does nothing if the spike comes from the house wiring.
Plugging the washer into a cheap strip to tame spikes can overload the strip.

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:21Sustained High Voltage and Bosch Washer dr:21 dr:22Bosch Washer dr:22 Reports Failure of the Inverter's Own Temperature Sensor dr:10Bosch Washer dr:10, When the Power Limiter Switches the Drive Off dr:11dr:11 on a Bosch Washer Means Supply Voltage Sags Under the Motor's Demand Er:21Bosch Washer Er:21 Reports Too Much Foam

dr:09dr:09 questions

Can a storm cause dr:09?

Yes. Lightning, outages and the surge when power returns can all produce brief spikes. If the code appeared once after a storm and did not return, it may need no repair.

Who should check the wiring?

A licensed electrician. They can measure the voltage at the outlet under load and test the neutral. We can tell you whether the washer itself tests normal.

Is the washer still safe to run?

If the code was a one-off, usually yes. If it repeats, an unstable supply can stress the inverter, so we would stop until the wiring is checked.