When a Smeg dishwasher develops a fault, it says so directly – E1 through E9, each code pointing to a different system. Some halt the cycle on the spot; others wait until the programme finishes. The code on the display is the starting point for every diagnosis, and this guide covers what each one means and what to do about it.
National Appliance Repairs repairs Smeg dishwashers across Australia, with same-day appointments available in most metro areas including Melbourne, Sydney, Brisbane, Perth, and Adelaide.
How Smeg Error Codes Work
Not all Smeg alarm codes behave the same way. E1, E2, E3, E4, E8, and E9 stop the cycle on the spot. E5 and E6 pause it – but if you address the cause mid-cycle, the machine picks up where it left off rather than requiring a restart. E7 is the exception: it doesn't interrupt the wash at all, appearing only at the end as a warning about the flow meter.
A door open-and-close or a power cycle at the wall will clear the display. If the same code reappears, the reset hasn't fixed anything – it's just confirmed the fault is real.
Smeg Dishwasher Error Code Quick Reference
| Code | Fault | Action |
|---|---|---|
| E1 or E9 | Overfill / Flood Switch Activated | Check inlet valve and base for leaks |
| E2 | Overfill via Pressure Switch | Inspect pressure switch and inlet valve |
| E3 | Heating Fault | Test heating element and thermostat |
| E4 | NTC Temperature Sensor Fault | Check sensor connections and resistance |
| E5 | Water Fill Issue | Inspect inlet hose and valve |
| E6 | Drain Fault | Clean filter and drain pump |
| E7 | Flow Meter Fault (Warning) | Inspect flow meter turbine |
| E8 | Wash Pump Fault | Check pump for obstruction or failure |
E1 / E9 – Overfill and Flood Switch Activation
E1 and E9 both relate to water exceeding the safe level. E1 activates when the flood prevention float switch in the base pan is triggered and stays closed for more than five seconds. Common causes: a faulty inlet valve that keeps filling after the fill phase, a blocked filter preventing drainage, or excessive foam from wrong detergent. If you've accidentally used regular dish soap, open the door and allow the foam to settle. For E9, check the base pan for water accumulation before restarting.
E2 – Overfill via Pressure Switch
E2 indicates overfilling via the pressure switch – the component that monitors water level. If the switch gives an incorrect reading, it can report an overfill even at normal levels. Check the wiring and connections between the switch and the PCB. A faulty pressure switch typically needs replacing.
E3 – Heating Fault
The machine took too long to heat the water – less than 1.5°C increase over 20 minutes is the threshold. A failed heating element or faulty heater relay is the most common cause. Test the element resistance with a multimeter, and confirm the spray arms rotate freely, as restricted water circulation can also prevent the machine from reaching temperature.
E4 – NTC Temperature Sensor Fault
The NTC sensor circuit has an open circuit or short at startup. Check all electrical connections at the sensor and the PCB. If connections are secure, measure sensor resistance against the manufacturer's specification. A faulty sensor needs replacing.
E5 – Water Fill Issue
The machine isn't receiving enough water. E5 pauses the programme and resumes it once the cause is corrected. Check the supply tap is fully open, the inlet hose isn't kinked, the mesh filter on the inlet valve isn't blocked, and that mains water pressure is adequate (typically 30–800 kPa). In hard water areas – common in parts of outer Perth and Adelaide where bore water is used – the mesh filter accumulates scale faster and should be checked more frequently.
E6 – Drain Fault
The machine couldn't drain within the set time. A blocked filter is the most frequent cause. To address it: unplug the machine, remove the lower basket and filter assembly, rinse both filter sections thoroughly under hot water, and inspect the drain pump for debris. Also check the drain hose for kinks and confirm it isn't immersed in standing water at the waste connection. Running a hot empty cycle monthly significantly reduces the frequency of E6 faults.
E7 – Flow Meter Fault (Warning Only)
The flow meter turbine, which monitors water consumption during the cycle, has reported a problem. Importantly, E7 doesn't stop the wash – it appears at the end of the cycle as a warning. The machine can complete the programme even with a faulty flow meter turbine, but the fault should be investigated. If the turbine is confirmed faulty it will need replacing; in some cases, a wiring issue at the turbine connector is the actual cause.
E8 – Wash Pump Fault
The wash pump – which circulates water through the spray arms during the wash cycle – has stalled or failed. Check the pump for any foreign objects that may be blocking the impeller. If the impeller is clear but the pump still won't run, the motor itself has failed and needs replacing. A failed wash pump is a professional repair.
Frequently Asked Questions
What does E1 mean on a Smeg dishwasher?
E1 means the flood switch in the base of the machine has been activated, indicating an abnormally high water level. This is usually caused by a faulty inlet valve that isn't closing, a blocked drain causing water to back up, or excessive foaming from incorrect detergent.
How do I reset a Smeg dishwasher after an error code?
Open and close the door, or turn the machine off at the power point and back on. If the same code reappears, the underlying fault needs to be fixed rather than cleared.
What causes E6 on a Smeg dishwasher?
E6 is a drain fault, most commonly caused by a clogged filter at the bottom of the tub or a blockage in the drain pump. Clean the filter, inspect the pump for debris, and check the drain hose for kinks or incorrect installation.
Can I use Smeg dishwasher while it shows E7?
Yes – E7 is a warning displayed at the end of the cycle and doesn't stop the machine from completing a wash. However, the flow meter fault should be investigated and repaired to prevent further issues.
Which Smeg error codes require a technician?
Codes involving the heating element (E3), temperature sensor (E4), wash pump (E8), and persistent drain or fill faults after DIY checks (E5, E6) generally require a qualified technician. E1 and E2 can sometimes be resolved by addressing detergent foaming or clearing a blocked filter, but a leak or faulty inlet valve is a professional repair.
Smeg Dishwasher Fault Doesn't Match This List?
Not all Smeg dishwashers use alphanumeric codes. Older and some mid-range models communicate faults through patterns of flashing lights rather than E-series codes on a display. If that's what you're seeing, the combination of which lights are flashing and how many are lit will point to the fault – your model's user manual is the most reliable reference for interpreting them.
National Appliance Repairs has experience across the full Smeg dishwasher range. Call 1300 434 380 to book a technician or arrange an over-the-phone consultation.
