Bosch Dishwasher E03 Error Code — What It Means
E03 means the control board did not see enough water enter the tub in the time it allows. The fill stalled and the cycle stopped.
On many models this traces back to the water inlet valve or a restricted supply. The dishwasher simply cannot pull in the water it needs to start washing.
Common Causes
- Closed or partial supply valve The under-sink shutoff is not fully open, so the tub fills too slowly.
- Clogged inlet screen filter Debris in the inlet screen chokes the water reaching the valve.
- Faulty water inlet valve A valve that will not open fully cannot fill the tub in the allowed time.
- Kinked inlet hose A pinched or frozen fill hose limits how fast water enters.
- Float switch fault A stuck float gives the board a false full reading and stops the fill early.
Step-by-Step Fix
- Confirm the under-sink water shutoff is fully open and run the faucet to check flow and pressure.
- Cut power at the breaker, then inspect the fill hose for kinks behind the unit.
- Shut the water, disconnect the inlet hose, and clean the inlet screen filter at the valve.
- Check the float inside the tub moves up and down freely with no debris holding it.
- Test the inlet valve for 120 volts during fill and confirm it opens when powered.
- Restore power and run a cycle to confirm the tub fills and E03 clears.
Parts Often Needed
| Part | Notes |
|---|---|
| Bosch dishwasher water inlet valve | Amazon | Replace if it gets voltage during fill but will not open. Match the model number. |
| Bosch dishwasher inlet screen filter | Amazon | Use if the screen is damaged and will not clean up. |
| Bosch dishwasher float switch | Amazon | Order if the float sticks or the switch fails a meter test. |
When to Call a Pro
If the supply is open, the screen is clean, and the valve still will not fill the tub, the inlet valve or control board may need replacement. On some Bosch models the power module is locked down, so have a Bosch technician handle a board fault.