4055578977 Genuine Motor Control Module Kit for Simpson Washing Machines 22S750J 22S650K 36S550J 36P450J 500MB 700LA K750B

For a large family of Simpson washing machines, part 4055578977 is the genuine motor control unit kit. The board controls the motor and switches its direction, which is how the machine agitates. It suits 73 models on file, including the 22S650, 22S741 and 22S750 series, the 36P450 and 36S550 series, 500M, 550M and 600M models, and the 700L and 750L ranges. Linked numbers are 0628271101, 0628200092 and 0628200105.

Simpson washer won't agitate or spin?

This module sits between the main controls and the motor, switching power to the motor windings and reversing its direction to give the back and forth wash action. When it fails, the machine may fill but not agitate, hum without turning, stop mid cycle or refuse to spin. Burnt tracks, swollen components or a scorched smell around the board are giveaways. Before replacing it, check the motor, the capacitor if fitted and the wiring plugs, since a seized motor or poor connection can damage a new board as well.

Part details

• Genuine Electrolux group part 4055578977
• Linked numbers 0628271101, 0628200092 and 0628200105
• Motor control unit supplied as a kit
• Listed for 73 washing machine models

Fitting the motor control kit

Unplug the washer and turn off the taps before opening the cabinet. Take clear photos of every plug and wire on the old module, then transfer them one at a time so nothing ends up swapped. Follow any instructions supplied with the kit. Once the cabinet is closed up, run a short wash and check the machine fills, agitates, drains and spins.

Questions about this part

Why is it called a kit?

Our records list it as a control unit motor kit for these Simpson machines. Use any instructions or fittings supplied with it. If your old board looks different, send us the model and serial number so we can confirm fit before you order.