Bosch 1400 express not reaching full spin.

This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.

Bosch Classix 1400 Express would not accelerate into full spin

The problem

The washing machine completed the wash cycle but would only turn slowly at the start of spin, then stop and retry repeatedly without reaching full spin. Later testing with no load showed the drum turning briefly, stopping for 20-45 seconds, then repeating. The fault started after the machine had been overloaded.

Likely cause

Confirmed fault was a cracked circular magnet behind the rear motor bearing, identified by the poster as the tacho magnet. Earlier suggestions in the thread were that the motor or PCB were the main suspects; the PCB swap did not cure it. A reset for out-of-balance mode was ruled out.

What fixed it

The control board was swapped first, but the fault remained. The motor was then removed and stripped down. The cracked tacho magnet was found on the original 7-pin motor. The poster rebuilt the replacement 1200 motor using the 7-pin plastic section from the failed motor so it matched the 1400 machine's wiring harness, then refitted the motor. The machine was then reported fully working.

Checks to try

• Observed repeated low-speed spin attempts and stopping
• Tested the machine empty and on spin only
• Checked motor brushes and found them looking good
• Checked drum for wobble/bearing wear
• Swapped the PCB with a spare board
• Removed and stripped down the motor
• Found the circular magnet behind the rear motor bearing cracked in half

Parts or tools mentioned

• Spare control board (PCB)
• Replacement motor from a Bosch 1200 Express
• Original 7-pin motor plastic section/template
• Cracked circular tacho magnet on original motor