Understanding Bosch Washer Er:05 and an Open Temperature Sensor

What Er:05 means

If your Bosch washes warm and hot programs with cold water, Er:05 may be the reason. The control checks the NTC temperature sensor constantly, and this code says its circuit is open, as though the wire had been cut. Bosch's two service documents agree on a damaged sensor or a broken cable, and the Vision manual points technicians to the heater test program to confirm.

Common causes of Er:05

NTC sensor failed open
Break somewhere in the sensor cable
Connector at the heater assembly loose

✓ One safe check you can try

1. You cannot test this at home. 2. To gather useful information, select a hot wash. 3. After about twenty minutes touch the glass of the door. 4. If the glass is still cool, make a note of that and of the program you ran. 5. Unplug the washer and tell us what you observed when you book.

! Why to stop there

The sensor sits in the same housing as the heating element, which runs on household current.
A broken cable and a failed sensor look identical from the display, so changing the sensor first can be the wrong part.
Probing a connector with a meter while the washer is wet or powered risks damage to the board.

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

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 Er:25Bosch Washer Er:25 When the Door Lock Coil Overheats E:36Bosch Washer E:36 and Drain Trouble on Newer Machines dr:01The dr:01 Code on a Bosch Washer: Inverter Power Switch Shorted

Er:05Er:05 questions

Will clothes still get clean without the sensor?

Cold cycles may run, but the control cannot manage heated programs safely, so it stops them. Detergent also works less well on greasy or heavily soiled loads without the heat.

How can I tell Er:05 from Er:06?

Er:05 means the sensor circuit is open, while Er:06 means it reads as shorted. The display tells you which one, and the repair for each is similar: fix the cable or swap the sensor.

Who tests the wiring, and how is the repair priced?

We test the sensor and its cable with a meter, then give you a written price before any work starts. Our repair carries a 30-day workmanship warranty on the parts and labor we supply.