As an expert technician, I have diagnosed the Smeg dishwasher with error code E7. This specific code indicates a Flow Meter (Turbine) failure. The Main Control Board has detected that water is entering the machine, but it is not receiving the required electronic pulses from the flow meter to measure the volume of water accurately. This prevents the dishwasher from reaching the correct internal water level.
Smeg dishwasher with error code E7: Troubleshooting Instructions
- Verify Water Supply: Ensure the external water tap is fully open and that there is adequate house water pressure. Check the inlet hose for any kinks or pinches.
- Clean the Inlet Filter: Turn off the water supply and unscrew the inlet hose from the back of the dishwasher. Use a pair of needle-nose pliers to remove the small plastic filter inside the Water Inlet Valve and clean any debris or limescale.
- Inspect the Flow Meter: Remove the left-hand side panel of the dishwasher. Locate the Air Break (the large, flat, transparent plastic tank). The Flow Meter is the small circular component with a two-wire plug attached to the side of this tank.
- Check Wiring Connections: Inspect the wiring harness connecting the Flow Meter to the Main Control Board. Look for signs of corrosion on the pins or wires that may have been damaged by small leaks.
- Test the Reed Switch: Use a multimeter to check the Flow Meter for continuity. Since it is a reed switch, it should toggle between 0 Ω and infinity (OL) when the internal turbine spins.
- Check the Pressure Switch: If the flow meter is functional, inspect the Pressure Switch and its thin rubber tube. Ensure the tube is not blocked by food debris or “gunk,” as this can provide a false reading to the controller.
Expected Ohmic/Resistance Values
- Water Inlet Valve: 3,500 Ω – 4,500 Ω (3.5k Ω to 4.5k Ω).
- Flow Meter (Reed Switch): Should show 0 Ω (continuity) momentarily as the magnet passes the sensor during rotation, and OL (Open Loop) when stationary.
- Wash Motor (Tachometer): 80 Ω – 150 Ω (if checking the motor feedback loop).
- Drain Pump: 150 Ω – 300 Ω.
Estimated Repair Cost
- Flow Meter / Reed Switch Sensor: $25 – $55 USD.
- Complete Air Break Assembly (if the turbine is stuck): $60 – $110 USD.
- Water Inlet Valve: $35 – $85 USD.
Warning: Always disconnect the dishwasher from the electrical power supply and turn off the water source before removing any panels or touching internal components. Failure to do so can result in electric shock or flooding.
Repair Difficulty
DIY (Moderate): This repair is manageable for a confident DIYer. It requires removing the side panel and using a multimeter for testing. However, if the issue persists after replacing the Flow Meter, the fault may lie in the Main Control Board, which may require Professional assistance.
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.
