As an expert technician, I have diagnosed the Smeg dishwasher with error code e8. This specific fault code indicates a malfunction in the Alternating Wash Diverter Valve (also known as the Water Distributor). This component is responsible for cycling water flow between the upper and lower spray arms. The error is triggered when the main control board fails to receive a position signal from the Microswitch located on the Diverter Valve assembly.
Smeg dishwasher with error code E8: Diagnostic and Troubleshooting Steps
- Power Reset: Disconnect the dishwasher from the power source for 10 minutes to clear the electronic memory. If the
e8code persists upon restarting, the fault is mechanical or electrical. - Inspect Spray Arms: Ensure the Spray Arms are not blocked or obstructed by dishes. If an arm cannot rotate, it can occasionally cause pressure fluctuations that interfere with the Diverter Valve positioning.
- Access the Diverter Valve: Disconnect the power and water supply. Lay the dishwasher on its back (be prepared for minor water leakage) and remove the bottom base tray to access the internal components.
- Check Wiring and Terminals: Locate the Diverter Valve assembly attached to the Sump. Inspect the wiring harness for signs of corrosion, moisture, or loose spade connectors.
- Test the Synchronous Motor: Use a multimeter to check the resistance of the small Synchronous Motor that drives the internal disk.
- Test the Microswitch: Check the continuity of the Microswitch that tells the control board the valve’s position. Manually click the switch to ensure it is not stuck.
- Inspect for Mechanical Blockage: Remove the Diverter Valve and check for debris (such as glass shards or toothpicks) inside the housing that may be preventing the internal disk from rotating.
Expected Ohmic/Resistance Values
- Synchronous Motor: 8,000 Ω – 12,000 Ω (8k–12k Ω). If the reading is “Open” (OL) or significantly lower, the motor coil has failed.
- Microswitch (Closed): 0 Ω – 2 Ω.
- Microswitch (Open): ∞ Ω (Infinity/No continuity).
Estimated Repair Cost
- Replacement Diverter Valve Assembly: $45 – $110 USD (depending on the specific Smeg model).
- Synchronous Motor only (if available separately): $20 – $40 USD.
Safety Warnings
Warning: Always disconnect the appliance from the electrical power supply and turn off the water inlet valve before attempting any repairs. When laying the unit on its back, ensure the drain hose is secured to prevent water from leaking onto the electronic control boards. Use protective gloves to avoid injury from sharp metal edges on the dishwasher chassis.
Repair Difficulty
Difficulty: Intermediate.
This repair is manageable for a DIY enthusiast with a multimeter and basic tools. However, it requires moving the appliance out of its housing and accessing the underside. If you are uncomfortable working with electrical components or water seals, a Professional technician is recommended.
I am a master Appliance Repair technician with over 35 years of experience in the field. I am passionate about helping people troubleshoot their appliances and fix common problems. My website, appliancemode.com, provides a wealth of information on troubleshooting common appliance issues and deciphering error codes. This website aims to empower people to tackle appliance repairs themselves and save money on service calls.
