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Error code reference

Bosch Washer Error Code Er:07

Unexpected heating (heater on at wrong time)

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What the Er:07 error code actually means

Your Bosch washer detected that the heating element switched on at the wrong time during a wash cycle, which the machine recognized as a fault and stopped to stay safe. This usually means a part called a relay is stuck in the on position and is sending power to the heater when it should not. A technician will need to inspect the heater and the relay to determine which component needs to be replaced.

Diagnostic procedure

The full Er:07 procedure

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1
First diagnostic step
Run test P16; check heater and heater relay.
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Most common causes of Er:07

Ranked by how often they cause this code
  1. 1Stuck heater relay on control board
  2. 2Faulty heater element with internal short
  3. 3Wiring fault in the heater circuit
  4. 4Control board failure

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Questions people ask about Er:07

What does Er:07 mean on a Bosch washer?
Er:07 means the washer detected that the heating element was active during a part of the cycle when it should have been off. The control board monitors the heater circuit and flags this as a fault to prevent overheating or damage. The most likely causes are a stuck heater relay or a shorted heater element. The machine will stop operation until the fault is resolved.
Is it safe to use my Bosch washer when Er:07 is displayed?
No, you should not continue using the washer while Er:07 is active. The error indicates uncontrolled heating, which means the element could be receiving power when it should not. Running the machine in this state risks overheating the water, damaging internal components, or creating a more serious electrical problem. Leave the machine off until the faulty component has been diagnosed and repaired.
How much does it cost to repair a Bosch washer with an Er:07 error?
Repair costs depend on which component has failed. A heater element replacement typically falls in the range of $100 to $250 including parts and labor. If the control board needs to be replaced due to a failed relay, costs can range from $200 to $450 or more depending on the model and local labor rates. Getting a diagnostic visit from a certified technician will provide a more accurate estimate based on your specific machine.
Can I fix Er:07 on my Bosch washer myself?
A knowledgeable DIYer can perform some of the diagnostic steps, such as inspecting wiring and checking the heater element for visible damage. However, diagnosing a stuck relay and replacing components on the control board involves working with high-voltage circuits and requires appropriate safety precautions and tools. Running the designated heater test procedure (P16) typically requires access to the service test mode, which may not be straightforward for all users. Professional repair is recommended if you are not comfortable working with appliance electrical systems.
Will resetting my Bosch washer clear the Er:07 error?
A reset may temporarily clear the error code from the display, but it will not resolve the underlying hardware fault. If the heater relay contacts are stuck or the heater element is shorted, the fault condition still exists and the code will return once the machine runs again. The component causing the unintended heating must be repaired or replaced to permanently clear Er:07.

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