Bosch SHPM78Z55N 24 in 500 Series Top Control 44 dBA E20 Error Fix: Circulation Pump Motor Winding Fault

Error code E20 on the Bosch SHPM78Z55N 24 in 500 Series Top Control 44 dBA means: Circulation Pump Motor Winding Fault. The circulation pump motor has a winding fault. The control board has detected an electrical problem with the pump motor (open winding, shorted winding, or excessive current draw). The pump motor must be replaced. In many Bosch dishwashers, the wash pump and heating element are integrated into a single assembly (the heat pump module), so replacing the pump may require replacing the entire module. Check wire harness connections before replacing components.

The most successful fix is "Replace Circulation Pump and Heat Pump Module Assembly" (hard difficulty, ~120 minutes). Estimated DIY cost: $20-$30. HomeMD has 2 community-ranked fixes for this error.

This error is rated high severity. You should address it promptly — continued use could cause damage or safety concerns.

Yes — the top-ranked community fix ("Replace Circulation Pump and Heat Pump Module Assembly") is rated hard difficulty and takes about 120 minutes. Tools needed: T20 Torx screwdriver, Flathead screwdriver, Multimeter, Needle-nose pliers.

DIY cost: $20-$30. Professional repair typically costs $300-$450. Many homeowners save money by trying the top-ranked community fix first.

The Bosch SHPM78Z55N 24 in 500 Series Top Control 44 dBA has 8 other known error codes, including: E0 (No Fault Codes Recorded), E1 (Heating Problem), E12 (Calcification / Scale Buildup), E13 (Water Heating Timeout), E14 (Flow Meter / Water Sensor Error), and 3 more.

Error code E20 also appears on 11 other Bosch models: SHE3AR75UC 24 in 100 Series Front Control 50 dBA, SHE53C85N 24 in 300 Series Front Control 46 dBA, SHP65CM5N 24 in 500 Series Pocket Handle 44 dBA, SHP65TL5UC 24 in 500 Series Bar Handle 44 dBA with AutoAir, SHP878ZD5N 24 in 800 Series Pocket Handle 42 dBA, SHPM88Z75N 800 Series Dishwasher, and 5 more. The fix may vary by model, so check each model's specific page for tailored repair steps.