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Bosch Dishwasher E18 Error Code
Water level too low. Here is what it means and how to clear it, easiest fix first.
Not enough water reached the dishwasher, or it wasn't moved around properly. This usually comes down to low supply flow, a closed valve, or a kinked inlet hose.
Newer US models show E3200. Coolblue's Bosch and Siemens guide lists E18 with the other water supply codes (E14, E16, E17).
How to fix Bosch E18
Check the valve and inlet hose
Make sure the supply valve under the sink is fully open and the inlet hose isn't kinked or damaged.
Test the water flow
Bosch expects about 2.6 gallons (10 liters) per minute at the supply. Timing how long a nearby faucet takes to fill a bucket of known size gives a rough idea; very weak flow points to a plumbing problem rather than the dishwasher.
Reset the dishwasher at the breaker
Switch off the dishwasher's circuit breaker, wait about 30 seconds, then switch it back on. Run a short cycle with the dishwasher empty and watch whether the same code comes back. A code that clears and stays away was likely a one-time glitch.
When to call a technician
If the flow is low, a plumber should check the supply line and valve. If flow is fine and E18 continues, contact Bosch support.
Parts that commonly cause E18
- Water inlet valve
- Inlet hose
Order parts by your exact model number so they fit.
Other Bosch dishwasher codes
- E15Water detected in the base (leak protection)
- E24Dishwasher is not draining (blocked drain path)
- E25Drain pump blocked or pump cover loose
- E22Filter is blocked
- E23Drain pump fault
- E16 / E17Water can't enter the dishwasher
- E14Flow meter or filling problem
- E09Heating fault (meaning varies by region)
- E27Household power supply too low
- E12Limescale buildup in the heat pump
- E21Heat pump blocked
- E01-E05Control board or electronics fault
- E06Door sensor circuit fault
- E19Detergent dispenser fault
- E07 / E10CrystalDry (zeolite) drying fault
- H01Delay start is set (not an error)
Frequently asked questions
What does E18 mean on a Bosch dishwasher?
Not enough water reached the dishwasher, or it wasn't moved around properly. This usually comes down to low supply flow, a closed valve, or a kinked inlet hose.
Can I fix Bosch E18 myself?
Usually, yes. Most E18 problems clear with simple checks you can do at home. Start with the first step above: check the valve and inlet hose.
What if E18 keeps coming back?
A code that returns after a reset and the checks above usually means a part is wearing out. Note when E18 appears (which cycle, how often) and have your model number ready; it helps a technician bring the right part on the first visit.
Last reviewed 2026-10-19. Codes and steps can vary by model; check your owner's manual.