Bosch Dishwasher Error Code E02

Bosch Dishwasher Error Code E02 — What It Means and Why It Happens

The Bosch E02 error typically indicates a problem with water filling or water-level detection inside the dishwasher. In many Bosch models E02 is reported when the machine senses insufficient water flow or a fault in the inlet/fill detection circuitry (flow meter, float/pressure sensor, or inlet valve). This error can be triggered by a closed or kinked supply, blocked inlet strainers, a failed inlet valve, a clogged or faulty flow meter, or a stuck float/pressure chamber. Common user impacts include interrupted wash cycles, dishes not being cleaned properly, longer total cycle times as the machine retries to fill, and — in some cases — increased risk of leaks or water damage if a fault goes unaddressed. Because the dishwasher controls rely on correct water sensing, ignoring E02 may lead to frequent stoppages and inconvenient repeat cycles.

Common Causes

• Closed or partially closed household water supply valve
• Kinked or pinched inlet hose restricting flow
• Clogged inlet hose strainer or filter screen at the supply connection
• Faulty or sticking water inlet valve (fails to open/close properly)
• Defective flow meter (turbine) or blocked flow meter path
• Stuck or faulty float switch / pressure chamber (water level sensor)
• Low incoming water pressure from the house plumbing
• Electronic fault on the control board or wiring/connectors to sensors
• Debris or hard-water buildup inside the inlet path or filters

Troubleshooting Steps

1. Power cycle the dishwasher: turn off power at the wall or breaker for 1 minute, then restart. Some transient faults clear with a reset.
2. Cancel the current program and attempt a short diagnostic or refill cycle per your model’s manual to reproduce the issue.
3. Verify household water: ensure the water supply valve to the dishwasher is fully open and other fixtures have normal flow.
4. Inspect the inlet hose for kinks, twists, or compression; straighten or replace if damaged.
5. Turn off water, disconnect the inlet hose at the valve, and check/clean the small strainer/screen on the hose connection. Reconnect securely.
6. Check water pressure: low supply pressure (often below ~20 psi / 1.4 bar) can prevent proper filling — consult a plumber if pressure is low.
7. Listen for the inlet valve when starting a cycle: if you don’t hear a click or hum when filling should begin, the inlet valve may be faulty and require replacement.
8. Remove the dishwasher filter assembly and inspect the area for debris that could block the flow meter or pump; clean as needed. Some flow meters sit behind the lower filter basket.
9. Inspect the float/pressure chamber at the base for obstructions or stuck position. Carefully clear any debris and ensure it moves freely.
10. Check wiring and connectors for the inlet valve, flow meter, and float/pressure sensor for corrosion, loose pins, or water intrusion. Re-seat connectors if safe to do so.
11. Run the dishwasher’s diagnostic/service mode (if available) to view error history and sensor readings; refer to your model’s service sheet for mode entry instructions.
12. If the fault persists after the above checks, replace the suspected component (inlet valve, flow meter, or sensor) or contact a qualified Bosch technician to test components and the control board.

Maintenance / Prevention Tips

• Keep the inlet hose and the shut-off valve accessible and inspect for kinks every 6 months.
• Clean the inlet hose strainer and dishwasher filters monthly to prevent debris buildup.
• Run a monthly maintenance wash with a dishwasher cleaner or citric acid to reduce limescale around sensors and valves.
• Use a water softener or descaler if you have hard water to limit mineral deposits on the flow meter and inlet valve.
• Avoid over-tightening hoses to prevent damage to the strainer screen or threads.
• Replace rubber inlet hoses every 5 years or sooner if showing wear or bulging.
• Maintain proper household water pressure; have a plumber check pressure if other fixtures also show low flow.
• Inspect the dishwasher base for signs of leaks and dry it promptly to avoid sensor corrosion or short circuits.
• Use the correct detergent and rinse aid amounts to reduce residue that can clog small passages.
• Run hot water at the kitchen sink before starting the dishwasher so the first fill is hot and flow sensors behave predictably.
• Keep the door gasket and filter housing free from food debris that could interfere with float movement.
• Have the dishwasher professionally serviced every 2–3 years, especially if used heavily.
• When moving or installing the appliance, ensure hoses are free of twists and properly supported.
• Consider installing an anti-flood device or automatic shutoff if you have frequent supply issues.

FAQs

Conclusion / Safety Notice

Addressing an E02 error promptly helps avoid interrupted cycles, damaged dishes, or water damage to your home. Always cut power and water before attempting internal inspections, and avoid performing electrical repairs unless you are qualified. If the issue involves replacing the inlet valve, flow meter, pressure sensor, or the control board, or if you find evidence of leaking or corrosion, contact a certified Bosch technician to ensure safe, correct repairs.