Westinghouse i5B

Westinghouse error code I5B indicates: Westinghouse WDF Series / Fast 30 Wash Dishwasher: Circulation pump inverter DC bus overvoltage alarm i5B; rectified bus voltage exceeds 430V DC..

The primary root cause for Westinghouse code I5B is: On Westinghouse (Westinghouse WDF Series / Fast 30 Wash Dishwasher) models: Mains electrical grid voltage surge, rapid deceleration of heavy wash arm water momentum, or defective DC bus capacitor bank..

To resolve error code I5B: Measure incoming AC line voltage (nominal 230V AC ± 10%). Disconnect power for 10 minutes to discharge capacitors, then retest. Press Start/Pause together with Temp button for 5 seconds to exit service diagnostic mode and clear persistent EEPROM alarm.

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Westinghouse code I5B persists, the physical component causing On Westinghouse (Westinghouse WDF Series / Fast 30 Wash Dishwasher) models: Mains electrical grid voltage surge, rapid deceleration of heavy wash arm water momentum, or defective DC bus capacitor bank. must be inspected or replaced.

Set a digital multimeter to ohms (Ω). Disconnect power and test 3-Phase Motor Windings / Tacho Generator / Carbon Brushes across Across phase pins U-V, V-W, U-W on motor harness; across tacho pins. Expected nominal reading is 3Ω–6Ω (BLDC phase U-V-W) / 60Ω–180Ω (Tacho coil) / 1.5Ω–3.5Ω (Universal stator). Tolerance: BLDC phase winding values must be strictly balanced within ±0.3Ω. Hand rotation generates 1V–4V AC on tacho..

Standard electrical safety protocol: 1. Disconnect 230V mains power before opening panels. 2. Verify zero voltage at test points. 3. Allow hot water or heating elements to cool below 30°C before handling.