Dishwasher i20 Error – Causes, Diagnostics & How to Fix It
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Understanding the Problem
Brief explanation: The i20 error on many dishwashers (commonly seen on Bosch/Siemens-style control displays) indicates a water-inlet or water-supply/filling fault — the machine is not getting the correct water supply or the inlet/fill system is reporting a problem. It can be caused by a closed house shutoff, blocked inlet screen, failed inlet valve, a tripped float/anti-flood device, or a failed sensor/pressure switch. Step-by-step diagnostic & repair steps: 1) Confirm the symptom and reset: Power off the dishwasher (turn off at the breaker or unplug) for 1 minute, then restore power. Turn the water supply to the dishwasher fully on. If the i20 clears and normal fill resumes, the problem may have been temporary (low house pressure or a stuck valve). If code returns, continue diagnostics. 2) Check the house water supply: Verify the shutoff valve under the sink (or at the inlet) is fully open. Inspect the supply hose for kinks or visible damage. 3) Inspect the inlet hose and screen: Turn off water and power. Unscrew the flexible supply hose from the dishwasher inlet and check the hose and valve screen/strainer for debris or mineral buildup. Clean screens with a brush and water. Reconnect and test. 4) Listen for the inlet valve: With power restored and a cycle started, listen at the toe-kick area for a click when the machine attempts to fill. No click can indicate no power to the valve or a bad valve. 5) Check water pressure: Low home water pressure can prevent proper filling. If your faucet flow is weak at the same supply, correct plumbing issues first. 6) Check the flood/float switch (anti-flood device): Remove the lower access panel and locate the float or leak sensor (often in the sump/basement area). If there is water in the base or the float is stuck in the raised position, drain and clear it. Dry the base and reset per manual instructions. 7) Test the inlet valve electrically: Turn power off. Disconnect the inlet valve wiring and measure coil continuity with a multimeter. You should see continuity (in most models — a dead coil means replace). With power on and cycle started, measure voltage to the valve; if voltage is present when the machine should fill but valve doesn't open, replace the valve. 8) Check the flow meter / pressure sensor (if fitted): Some models use a flow sensor or pressure chamber to confirm fill. Inspect for blockages and test per your model’s service manual. 9) Replace suspect parts: If cleaning and ensuring supply doesn’t fix it, commonly replace the water inlet valve or the anti-flood/float switch. Follow the replacement steps below (example: inlet valve replacement). How to replace a typical inlet valve (general steps): - Tools: screwdriver set, pliers, multimeter, towel, bucket. - Turn off power at breaker and shut off water supply. - Remove the lower toe-kick/access panel to reach the valve (often at the left or right bottom corner). - Place towel/bucket to catch water. Disconnect the water supply hose from the inlet valve and remove retaining screws/clips securing the valve. - Disconnect electrical connectors from the valve (note wire locations or take a photo). - Install the new valve: connect wires, secure valve, reconnect supply hose with the screen in place, restore water and power. - Run a short fill cycle and watch for proper fill and leaks. Ending safety note: Always disconnect power at the breaker and shut off the water before accessing internal components. If you’re not comfortable working with electrical components or accessing internal dishwasher parts, call a qualified appliance technician.
Common Symptoms
Dishwasher displays i20 (or intermittent i20), fails to fill, pauses with no water, may click but not draw water, or will not start the wash cycle because it thinks there’s no water supply.
Common Causes
- Household water shutoff closed or low water pressure
- Clogged screen/strainer in the water supply hose or inlet
- Failed water inlet (fill) valve or its solenoid
- Stuck or tripped float/anti‑flood device (water in base)
- Faulty flow meter/pressure sensor or wiring/PCB fault
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Helpful Repair Tip
Start simple: confirm the house shutoff is fully open and check/clean the inlet hose screen. If the machine clicks to fill but no water flows, the inlet valve is the most likely failed part — test it for continuity and for applied voltage during a fill command to confirm.
Frequently Asked Questions
Will clearing the i20 code by restarting the dishwasher fix it permanently?
Sometimes a temporary condition (brief low water pressure or a stuck valve) will clear with a power cycle, but if the i20 returns it indicates an underlying water supply, inlet valve, float, or sensor problem that should be diagnosed and fixed to avoid repeated faults and potential leaks.
How much will it cost to fix an i20 error?
Cost varies: cleaning the hose and inlet screen is free if you do it yourself. A replacement inlet valve part typically costs between $30–$120 depending on brand/model; labor from a technician commonly adds $100–$250. If the float assembly or sensors are the problem, parts and labor are similar. Get a model-specific parts quote for an accurate estimate.
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