FAQ
TL;DR: If your Bosch WAS28743PL/01 shows F57, focus on the 3‑phase drive — "This motor is powered by 3 phases from the inverter module." Avoid direct mains tests; inspect or service the inverter board. [Elektroda, cezet, post #17027442]
Why it matters: For Bosch WAS28743PL/01 owners/DIYers with F57, this steers diagnosis to the right module and prevents damage.
Quick Facts
- Fault map: F57 = inverter failure; target the inverter/motor module, not mechanical parts. [Elektroda, magir, post #17023389]
- Motor type: 3‑phase brushless; never power it directly from mains. [Elektroda, cezet, post #17027442]
- Symptom pattern: door locks, drain pump starts, beeper + F57; emergency release may be needed. [Elektroda, artursosinski, post #17022328]
- Board issue clue: visible cold solder on the main inverter IC legs; careful reflow may restore operation. [Elektroda, h jaworski, #17024717]
- Proven fix (case outcome): failed motor module replaced to clear F57. [Elektroda, artursosinski, post #17869529]
What does error F57 mean on a Bosch WAS28743PL/01?
F57 flags an inverter failure. The control inverter that drives the motor is the primary suspect. As one expert put it, "F57 error is a failure of the inverter." Plan diagnostics or replacement around that board, not the pump or mechanics. [Elektroda, magir, post #17023389]
What symptoms will I see when F57 triggers?
After you close the door, the lock engages, the drain pump starts, then the alarm sounds and F57 appears. The door won’t open normally; use the emergency release to retrieve laundry. This behavior repeats on every program until the fault is resolved. [Elektroda, artursosinski, post #17022328]
Does this model use a brushless motor?
Yes. It’s a brushless motor with 3 connectors. That means there are 0 brushes to wear or replace, and diagnostics center on the inverter drive and wiring. "Exactly the motor is brushless and has 3 connectors." [Elektroda, artursosinski, post #17023250]
Can I power the motor directly to test it?
No. "This motor is powered by 3 phases from the inverter module" and is not designed for direct mains. Applying line voltage to the three pins risks damaging the inverter, the motor, or both, and creates a shock hazard. Use board-level diagnostics instead. [Elektroda, cezet, post #17027442]
How do I inspect the inverter for cold solder joints?
Three-step check: 1) Unplug washer and remove the motor/inverter module. 2) Under good light, inspect the main IC legs for dull or cracked joints. 3) Reflow suspicious legs carefully and retest. Cold joints on that IC are visible and a rework "may work." [Elektroda, h jaworski, #17024717]
What ultimately fixed the F57 in this thread?
The motor module (inverter) was defective. Replacing the motor module resolved the F57 and restored operation. This was the confirmed outcome reported by the original poster after troubleshooting and inspection. [Elektroda, artursosinski, post #17869529]
Should I check the drain pump when I get F57?
Focus on the inverter. F57 specifically denotes an inverter failure, so clearing a pump blockage will not resolve this code. Direct your time to inspecting, reworking, or replacing the inverter/motor module instead of the drain circuit. [Elektroda, magir, post #17023389]
Do I need to inspect motor brushes or a commutator?
No. This washer uses a brushless drive, so there are no brushes or commutator to inspect. Diagnostic effort belongs on the inverter electronics and connections to the 3‑pin motor. That removes a common wear item from the checklist. [Elektroda, artursosinski, post #17023250]
What happens if I try to run the motor straight from the wall?
It is an edge-case failure path: "each giving it power will only end badly." The inverter and motor can be destroyed by inappropriate mains tests. Use the inverter to drive the motor or bench-test the board with proper equipment only. [Elektroda, cezet, post #17027442]
Is the motor sold as a complete unit for this washer?
Yes, the drive motor is available as a dedicated part for the Bosch WAS28743PL/01. That listing confirms model compatibility if you choose to replace the motor or verify its specifications before inverter work. [Elektroda, wiesiekmisiek, post #17027411]
How can I open the door after F57 to get my clothes?
Use the emergency door release. With F57 present, the door lock does not release normally after the alarm. The emergency method allows you to retrieve laundry while you plan inverter diagnostics or replacement. [Elektroda, artursosinski, post #17022328]
Where should I focus if I already checked brushes, bearings, or a tacho?
Concentrate on the inverter. The motor in this model is inverter‑controlled, so legacy checks for brushes or commutator faults do not apply. The fault source lies in the inverter electronics or its connections. [Elektroda, zibi1971, post #17023355]