12019637 Genuine Dishwasher Heat Pump for Bosch, Siemens Dishwashers SMS50M22AU SMS63M28AU SMS40M18AU SMU68M15AU SMV88TX01A SN26M282AU

Bosch and Siemens dishwashers in the SMS, SMU, SMI, SMV and SPU ranges, plus Siemens SN26M models, use this genuine heat pump, part 12019637. It combines the circulation pump and the water heater in one unit. Listed models include the SMS40M18AU and SMS50M22AU, the SMS63M28AU and SMS68M38AU, the SMU68M25AU, the SMV88TX01A and the SN26M282AU, each tied to particular production indexes.

Bosch dishwasher not heating or not washing?

In these dishwashers the heater is built into the pump housing. Water is warmed as it passes through, then pumped out to the spray arms. That means one part covers two jobs, and a failure can show up in two ways. If the heater side fails, dishes come out cold and greasy, the cycle runs far longer than normal, or a heating fault is shown. If the pump side fails, you may hear humming or grinding with little or no spray, and dishes stay dirty. A heater fault can also trip the safety switch.

Part details

• Genuine Bosch part 12019637
• Circulation pump with built in heater
• Listed for Bosch SMS, SMU, SMI, SMV and SPU models plus Siemens SN26M dishwashers
• Models are listed with production index, for example SMS50M22AU/01

Fitting the heat pump

Unplug the dishwasher at the wall and shut off the water tap. Remove the machine from its cavity, empty the sump and carefully tilt it back on towels to reach the pump underneath. Take photos of the hoses and electrical plugs before removing anything. Fit the new pump with fresh clamps where needed, reconnect everything, stand the machine upright and run a cycle while checking for leaks.

Questions about this part

How do I check my model's production index?

Open the door and look along the edge of the inner door or the side of the tub for the label showing the E-Nr, such as SMS63M28AU/93. This pump is listed against particular index numbers, so compare the full code with the listed models.