Bosch Error Code F43 — Error Code F43

Service Guy AI • Washer • Medium severity • Intermediate skill • ~30 min repair

What Does Bosch Error Code F43 Mean?

Bosch washer: Error Code F43

This is a medium-severity fault. The machine may complete the current cycle but is signalling a problem you should resolve before it escalates.

Possible Causes (5)

Bosch engineers identify the following root causes for fault code F43. Work through them in the order shown — they are listed from most common to least common.

1. Faulty pressure switch
2. Blocked drain pump
3. Door interlock malfunction
4. Control board issue
5. Wiring problem

Step-by-Step Troubleshooting (6 steps)

Follow this sequence to diagnose and clear Bosch error code F43. Power down and unplug the machine before any internal inspection.

1. Disconnect power before servicing.
2. Check the pressure switch for proper operation.
3. Inspect the drain pump for blockages or damage.
4. Test the door interlock for functionality.
5. Examine wiring connections for any signs of wear or damage.
6. Reset the control board and check for any stored error codes.

Required Parts

Have these Bosch OEM part numbers ready before starting the repair. AAdvantage Laundry Systems carries verified parts for every code in this database.

• Pressure switch
• Drain pump
• Door interlock
• Wiring harness
• Control board

Diagnostic Test Mode

Enter Bosch diagnostic test mode: Press and hold the 'Start/Pause' button while turning the program selector to 'Spin'.

Skill Level & Repair Time

This repair is appropriate for an experienced laundromat owner or in-house technician. You should be comfortable removing service panels, reading wiring diagrams, and using a multimeter to test continuity and voltage. Plan for approximately 30 minutes of active repair time once parts are on hand.

Get AI-Powered Diagnosis

If the steps above don't resolve Bosch F43, run a free Service Guy AI diagnosis. Upload a photo of the error display and get an AI-generated repair plan tied to your exact Bosch model number, including supplier links for required parts and on-call technician escalation.

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