FixByModel
F63

Bosch F63: Functional safety / control processor fault

F63 is a functional-safety error raised when the control board's processor or its software fails a self-check. It sometimes clears with a full power reset, but a recurring F63 usually means the control board needs attention.

May need a technician

By the FixByModel editorial team · Verified 2026-09 · Researched against manufacturer support & repair references (below)

Most likely causes

  1. Temporary software glitch after a power outage or electrical interference
  2. Power surge that disrupted the control board processor
  3. Failing main control board (PCB)
  4. Damaged wiring or connector to the control module
  5. Moisture or corrosion affecting the electronics
Before you start — unplug the appliance and turn off the water supply. You'll be working near water and electrical parts, and drained water can be hot. If a step involves the pump, wiring, or opening the cabinet and you're unsure, stop and call a qualified technician.

Step-by-step fix

1Full power resetSwitch the washer off and unplug it for about 15 minutes so the control module fully powers down, then restore power.
2Run a test programStart any short program and watch whether F63 reappears or the machine now runs normally.
3Check the supplyMake sure the washer is on a sound electrical circuit and not sharing an overloaded socket, since surges can trigger this fault.
4Watch for trippingIf the machine trips the breaker or fails to power on, stop using it, as this points to a hardware fault on the board.
5Call for serviceIf F63 keeps returning after a reset, have a technician diagnose and, if needed, replace the main control board.

Still showing F63?

If you’ve worked through every step and F63 keeps returning, an internal part likely needs testing and replacement. That’s a job for a qualified appliance technician, who can measure the suspect part against the service-manual spec before replacing it.

Which models this applies to

Bosch washing machines. Bosch washers with digital display; F63 is an electronic control (processor/software) safety fault, not a mechanical one.

FAQ

What does Bosch F63 mean?

Functional safety / control processor fault. F63 is a functional-safety error raised when the control board's processor or its software fails a self-check. It sometimes clears with a full power reset, but a recurring F63 usually means the control board needs attention.

What causes Bosch F63?

The most likely cause is temporary software glitch after a power outage or electrical interference. Other causes include Power surge that disrupted the control board processor; Failing main control board (PCB); Damaged wiring or connector to the control module; Moisture or corrosion affecting the electronics.

Can I fix Bosch F63 myself?

Some checks are DIY, but this code often points to an internal component, so it may need a qualified technician.