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Error code reference

Bosch Washer Error Code E:09

Heater doesn't shut off

Bosch codesBosch washer codes

Heater doesn't shut off — faulty heater or stuck heater relay.

First step from the service manual

Run test P16; check heater and heater relay.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What E:09 means on a Bosch washer

Error code E:09 on a Bosch washer indicates that the heating element is not shutting off as commanded by the control board. Under normal operation, the control board energizes the heater to raise water temperature to the selected wash temperature, then cuts power to the heater once the target is reached. When E:09 is triggered, the system has detected that the heater remains active beyond its intended cycle, pointing to either a defective heater element or a heater relay that has welded or stuck in the closed position.

The heater relay is located on the main control board and acts as the electronic switch that opens and closes the circuit to the heating element. If the relay contacts fuse together due to electrical arcing or age, the relay cannot open, and the heater runs continuously regardless of control board commands. A faulty heating element can also contribute if an internal short causes it to draw current in ways that stress the relay or prevent proper circuit interruption.

Diagnosing E:09 requires running test program P16, which exercises the heater circuit and allows direct observation of heater behavior and relay switching. During this test, a technician can confirm whether the heater de-energizes on command. Resistance testing of the heating element and inspection of the relay on the control board are the primary steps. A stuck relay typically requires control board replacement, while a shorted heater requires element replacement.

Source: manufacturer service documentation.

Common causes of E:09

  1. 01

    Stuck heater relay on control board

    Part replacement

    The relay that switches the heater circuit on and off can have its contacts fuse together due to arcing or wear, preventing it from opening. This keeps the heater energized continuously and is the most frequent cause of E:09.

  2. 02

    Faulty heating element

    Part replacement

    An internally shorted heating element can draw current outside of normal parameters, preventing the circuit from interrupting properly. Testing the element for resistance outside the specified range or for a short to ground will confirm this failure.

  3. 03

    Control board failure

    Part replacement

    Beyond the relay itself, broader failure of the main control board can result in the heater circuit receiving continuous commands to stay on. If relay and element both test acceptable, the control board logic is suspect.

  4. 04

    Wiring fault in heater circuit

    Wiring / connection

    A short circuit in the wiring between the control board and the heating element can mimic a stuck relay by keeping the circuit closed unintentionally. Inspect the heater circuit wiring harness for chafing, melted insulation, or contact with the drum.

See the test procedure for each cause

Frequently asked questions about E:09

What does E:09 mean on a Bosch washer?
E:09 means the washer's heating element is not shutting off when the control board commands it to stop. This points to either a stuck heater relay on the control board or a defective heating element. The diagnostic process involves running test program P16 to evaluate the heater circuit directly. The washer should not be operated normally until the fault is resolved.
Can I fix E:09 on my Bosch washer myself?
A knowledgeable DIYer can test the heating element for visible damage or continuity issues, but replacing the control board or diagnosing a stuck relay requires comfort with disassembly and electrical testing. Running test P16 is a specific service mode that typically requires familiarity with Bosch diagnostic procedures. If you are not comfortable working with line-voltage components, professional service is the safer route.
Is it safe to keep using my Bosch washer when E:09 is showing?
No, continuing to run the washer with E:09 active is not recommended. A heater that does not shut off can overheat the water and potentially damage internal components, hoses, or wiring. It is best to stop using the machine until the fault is diagnosed and repaired.
How much does it cost to repair a Bosch washer with error code E:09?
Repair costs vary depending on which component has failed. A replacement heating element typically runs in the range of $30 to $80 for the part, while a new or remanufactured control board can cost $100 to $300 or more. Adding professional labor, total repair costs commonly fall between $150 and $450 depending on the specific failure and your location.
Will resetting my Bosch washer clear the E:09 error?
A reset may temporarily clear the error code from the display, but it will not fix the underlying hardware fault. If the heater relay is stuck or the heating element is defective, the code will return as soon as the washer attempts to heat water again. A proper repair requires diagnosing and replacing the faulty component.

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