Bosch E18 Error Code — What It Means
The E18 error code on a Bosch washing machine indicates that the machine is not draining water properly. Bosch describes this as a drainage fault. Water may still be left in the drum when the code appears. The most common cause is a blocked pump filter or coin trap, though a kinked or blocked drain hose can also trigger the code. In some cases Bosch notes the code may point to a blocked cold-water inlet hose, but the primary service interpretation is a drainage problem.
Common Causes
- Pump filter or coin trap blocked Lint, coins, hairpins, buttons, or similar debris have accumulated in the filter cavity and prevent water from leaving the drum.
- Drain pump impeller jammed The pump impeller cannot rotate freely because of debris or mechanical damage.
- Drain hose kinked or crushed The hose is bent, pinched, or compressed at the installation point, blocking the flow of water.
- Household drain or standpipe restriction A blockage in the siphon, standpipe, or household drain prevents the washer from discharging water.
- Drain pump electrical or mechanical failure If cleaning does not restore drainage, the pump motor or its electrical connections may have failed.
Step-by-Step Fix
- Turn off the machine, unplug it from the outlet, and close the water supply valves to work safely.
- Protect yourself from scalding by remembering that the water inside may be very hot, especially if the fault occurred during a hot wash cycle.
- Open the service flap at the front lower corner, pull out the emergency drain hose, and drain residual water into a shallow pan before removing the pump cover.
- Remove the pump filter or coin trap by unscrewing the cover carefully, then clear all debris from the filter cavity, pump housing, and cover threads.
- Check that the pump impeller wheel inside the housing turns freely by hand. If it is stuck or does not rotate, remove any obstruction or replace the pump.
- Inspect the drain hose for kinks or blockages. Disconnect it from the standpipe or siphon connection and flush it with water if necessary.
- Refit the pump cover securely, pour about one liter of water into the detergent dispenser, and run a drain or empty program to verify the pump operates without leaks.
- If the E18 code persists after cleaning, contact a service technician to test the pump electrical connections, control board output, and replace the pump assembly if needed.
Parts Often Needed
| Part | Notes |
|---|---|
| Drain pump assembly | Amazon | Replace if the impeller is damaged or the motor does not run after cleaning. Match your model number for the correct pump. |
| Pump filter or coin trap cover | Amazon | Order if the threads are stripped or the cover seal is damaged and causes leaks after reinstallation. |
| Drain hose | Amazon | Replace if the hose is split, permanently kinked, or cannot be cleared of blockages. |
When to Call a Pro
Call a professional if the E18 code returns after you have cleaned the pump filter, verified the impeller turns freely, and checked the drain hose for obstructions. A technician will test the pump motor for electrical continuity, inspect the wiring harness and control board output, and replace the pump assembly if it has failed. If you are uncomfortable draining hot water manually or removing the pump cover, a service visit is the safer choice.