Error Code: F20 Difficulty: Hard
Problem: Unexpected heating during the cycle.
How to Fix F20 Error (Step-by-Step)
- Disconnect the washer from its power source and confirm the error stays cleared during a full test cycle.
- Access the main control board, which is typically located behind the control panel or in the top section of the machine.
- Locate the heating element relay on the control board. It is a small, often black, rectangular component.
- Carefully desolder the old relay from the control board using a soldering iron and desoldering pump or wick.
- Solder the new heating element relay onto the control board, ensuring all connections are secure.
- Reinstall the control board and any panels that were removed.
- Reconnect the power and run a cycle to ensure the heating issue is resolved.
- Turn the appliance off, wait about 2 minutes, then turn it back on.
What to Check Next on This Bosch Washer
Bosch Washer Error F20: Use the code or symbol as the starting clue, then confirm the actual symptom before ordering parts.
- Unplug the washer before touching wiring, the lock, the pump area, or the control panel.
- Check the door lock, drain filter, inlet supply, and visible harness connections before replacing controls.
- If the code returns during the same part of the cycle, match the repair path to that stage: fill, wash, drain, spin, lock, or control response.
If the issue returns after these checks, match replacement parts to the complete Bosch model number from the appliance tag. The same code can point to different components depending on the exact model and when the failure appears.
- Heating Element Relay
Likely Parts to Check
No exact official OEM part number is listed here because the correct Bosch Washer part can vary by full model number. These are targeted part-category searches, not universal fit claims.
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Washer electronic control boardCommon replacement category: Main control boardFit note: Exact OEM part number varies by model. Confirm compatibility using the full model number before buying.Confidence: Medium
This category can be relevant for control and communication faults after wiring checks. Inspect wiring, connectors, airflow, water path, or filters first as applicable. -
Washer user interface control panelCommon replacement category: User interface / display boardFit note: Exact OEM part number varies by model. Confirm compatibility using the full model number before buying.Confidence: Medium
This category can be relevant for display, button, selector, or cycle-control faults. Inspect wiring, connectors, airflow, water path, or filters first as applicable. -
Washer drain pump assemblyCommon replacement category: Drain pumpFit note: Exact OEM part number varies by model. Confirm compatibility using the full model number before buying.Confidence: Medium
This category can be relevant for drain, no-spin, and water-removal symptoms after filter checks. Inspect wiring, connectors, airflow, water path, or filters first as applicable.
Before ordering: match the part to the complete model number on the appliance tag.
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Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.
When It’s Better to Replace Than Repair
Sometimes replacing an appliance makes more financial sense than putting more money into repairs.
Here are a few signs it may be time to shop for a new one:
For repair parts, verify exact fit with the full washer model number before buying; these links are general replacement-appliance shopping options.
- ✓Appliance over 8-10 years old
- ✓Repair cost over 50% of replacement
- ✓Multiple recent breakdowns
- ✓Major component failure
Recommended Replacement Options
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