Bosch washer — Error Code E18
The washing machine failed to empty the water within the required timeframe.
What it means
The E18 error on a Bosch laundry unit signals a significant drainage fault. This happens when the main control board (PCB) triggers the drain pump to remove water, but the analog pressure sensor fails to detect an empty state within the expected 90 to 180-second window. Once this limit passes, the controller stops the cycle, engages the door lock to prevent water leakage, and displays E18. Usually, this points to a mechanical pump failure or a flow obstruction, though occasionally a blocked pressure chamber or a faulty triac on the motor control circuit is to blame.
Likely Causes
- 1 Clogged Pump Filter (Coin Trap)Debris like lint, coins, or bobby pins is physically jamming the drain pump impeller.
- 2 Faulty Drain Pump MotorElectrical winding failure or worn-out bearings that cause the magnetic impeller to seize during operation.
- 3 Blocked Drain Hose or StandpipeThe external drain hose is kinked, or there is a restriction in the home plumbing preventing water from exiting.
- 4 Obstructed Tub-to-Pump SumpSmall items like baby socks have slipped past the drum seal and are blocking the eco-valve or sump hose.
- 5 Pressure Sensor/Chamber IssueThe air dome is clogged, stopping the pressure switch from returning to the baseline empty state.
How to clear / reset
To reset the E18 alert, turn the cycle selector to 'Off' to power down the control board. Let it sit for 60 seconds, then try a 'Spin/Drain' cycle to see if the pump engages. If the machine is still full of water, you must drain it manually using the small auxiliary hose found next to the pump filter behind the lower front panel. Because E18 is a hard fault, it will reappear immediately on your next wash if the mechanical blockage or pump issue remains.
Common replacement parts
When to call a pro
Contact us if clearing the filter and checking the hose doesn't fix the E18 code. Diagnosing the drain pump requires using a multimeter to verify 120VAC at the terminals and checking for 150-200 ohms of winding resistance. If the pump tests fine but gets no voltage, the main control board might need component-level testing. A-Fix Service provides a $90 diagnostic fee (waived if you proceed with the repair) and includes a 1-year warranty on parts and labor for all Bosch washer repairs.
FAQs
How much does it cost to fix a Bosch E18 error?
A simple filter cleaning is a free DIY fix. If the drain pump motor is broken and needs replacement, you should budget between $180 and $300 for professional labor and OEM parts.
Can I fix the E18 code myself?
Yes, you can manually drain the unit and clean the coin trap filter located behind the lower right access panel. If the pump has failed, you can replace it yourself, though it requires front panel disassembly and working with electrical components.
Will the E18 code clear itself?
No, the control board will keep the cycle locked until the water is removed and the pressure sensor confirms the tub is empty.
How long does it take a tech to fix this?
An experienced technician can typically clear a sump blockage or swap out a Bosch drain pump in about 45 to 60 minutes.
Will running the washer with an E18 code damage it?
The washer will not run while the code is active. Repeatedly forcing the machine to reset and run with a stalled pump can cause the motor to overheat and potentially damage the main control board.
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