Bosch Washer Er:15 When the Pressure Sensor Voltage Is Out of Range

What Er:15 means

Overfilling, underfilling or a refusal to spin are the signs behind Er:15 on a Nexxt front-loader. The washer judges the water depth with a pressure sensor connected to the tub by a thin air tube, and here the sensor's electrical output is outside the valid range. Bosch blames either the sensor or the wiring that connects it.

Common causes of Er:15

Sensor has failed
Wiring to the sensor deteriorating
Air tube clogged, cracked or pulled off its fitting

✓ One safe check you can try

1. There is no home measurement for this. 2. Instead, watch the next cycle and note whether the tub seems to take too much water, too little, or refuses to spin. 3. Write down what you saw and the program you chose. 4. Unplug the washer and share the notes when you call. All three behaviors follow from a level the control cannot read.

! Why to stop there

The pressure sensor sits on the control side, and opening the console while plugged in exposes live parts.
A split or loose air tube mimics a bad sensor, so replacing the sensor first can leave the problem unsolved.
Blowing into the pressure hose can force water into the sensor and ruin 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.

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Other Washer codes

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Er:15Er:15 questions

What does a pressure sensor do in a washer?

It senses the air pressure built up in a tube as the water rises, which tells the control how deep the water is. From that it decides when to stop filling and begin washing.

Could the air tube be disconnected?

Yes. A tube that has come off, split or filled with water gives a wrong reading. Checking it is quick for a technician, so we look before replacing the sensor.

Is it safe to wash with this error?

We would not. If the control cannot read the level it may overfill. Unplug the washer and wait for the repair rather than testing it with a full load.