How to Fix E-22 (Bosch Dishwasher)
Quick Answer
The Bosch dishwasher error code E-22 indicates that the appliance is unable to drain water. This is most frequently caused by a clogged filter system. Cleaning the filter system is often the fastest solution to resolve the E-22 error.
What Causes This Error
- Clogged filter system (coarse filter, fine filter, microfilter)
- Blocked drain pump impeller
- Kinked or obstructed drain hose
- Malfunctioning drain pump
- Issues with the dishwasher's internal non-return valve
- Sump area debris accumulation
Step-by-Step Fixes
1Clean the Filter System (E-22)
- Turn off the dishwasher and disconnect it from the power supply to prevent accidental operation.
- Open the dishwasher door and locate the filter assembly at the bottom of the wash tub. This typically consists of a coarse filter, a fine filter, and a microfilter.
- Twist the coarse filter anti-clockwise to unlock it, then carefully lift out the entire filter assembly.
- Rinse all filter components under running water, using a soft brush or sponge to remove any food particles, grease, or debris. Ensure all perforations are clear.
- Reassemble the filter system, ensuring it clicks securely back into place. Restore power to the dishwasher and test for proper drainage.
2Inspect and Clear the Drain Hose
- Disconnect the dishwasher from the power supply.
- Locate the drain hose, which typically connects from the back of the dishwasher to the household drainage system (e.g., under the sink or a standpipe).
- Visually inspect the entire length of the drain hose for any kinks, bends, or obvious obstructions. Straighten any kinks found.
- If accessible, disconnect the drain hose from both the dishwasher and the household drain. Carefully check inside the hose for blockages using a flashlight. If a blockage is present, attempt to dislodge it with water pressure or a flexible brush. Reconnect the hose securely.
- Restore power and attempt to run a short cycle to confirm the E-22 error is resolved.
3Clear the Drain Pump Impeller Area
- Ensure the dishwasher is turned off and disconnected from the power supply.
- Remove the filter system as described in the 'Clean the Filter System' fix.
- Use a sponge or towel to soak up any standing water in the sump area. Once the water is removed, you should see a small cover or a visible impeller at the bottom of the sump.
- Carefully remove any visible debris (e.g., glass shards, food particles, labels) from around the pump impeller using gloves. Some models may require removing a small plastic cover over the impeller; consult your appliance manual for specific instructions.
- Rotate the impeller manually to ensure it spins freely without obstruction. Reinstall any covers and the filter system. Restore power and test the dishwasher.
4Check the Air Gap (If Applicable)
- Locate the air gap on your kitchen countertop, typically a small cylindrical fitting near the faucet. This is common in installations where the drain hose connects to a garbage disposal.
- Unscrew and remove the air gap cap and the decorative cover.
- Inspect the internal components of the air gap for any food debris or blockages. Use a small brush or a paperclip to clear any obstructions.
- Ensure the hoses connected to the air gap are clear. Reassemble the air gap, ensuring all components are seated correctly. Test the dishwasher.
Advanced Fixes
Inspect and Replace the Drain Pump
- Disconnect the dishwasher from the power supply and turn off the water supply valve.
- Carefully pull the dishwasher out from its cabinet enclosure. Some models may require removing the lower access panel at the front.
- Locate the drain pump, typically found at the bottom of the dishwasher. Disconnect the electrical wiring and the drain hoses attached to the pump. Be prepared for some residual water.
- Remove the mounting screws or clips holding the drain pump in place. Carefully remove the old pump.
- Install the new drain pump, ensuring all connections are secure. Reconnect wiring and hoses. Slide the dishwasher back into place, restore water and power, and test operation.
Check the Dishwasher's Non-Return Valve
- Ensure the dishwasher is disconnected from the power supply and the water supply is off.
- Access the drain pump area, which may require tilting the dishwasher or removing the bottom panel. The non-return valve is often located near the drain pump or at the connection point of the drain hose to the sump.
- Carefully remove the non-return valve. It may be integrated into a hose or a separate component. Inspect it for any debris, cracks, or signs of wear that would prevent it from opening or closing properly.
- Clean any debris or replace the valve if it appears damaged. Reinstall the valve, ensuring it is correctly oriented. Restore power and water, then test the dishwasher.
Frequently Asked Questions
What does E-22 mean on a Bosch dishwasher?
The E-22 error code on a Bosch dishwasher indicates a problem with water drainage. This typically means that water is not being pumped out of the wash tub, often due to a blockage or a pump malfunction.
How often should I clean my dishwasher filter to prevent E-22?
It is recommended to check and clean your Bosch dishwasher's filter system regularly, ideally once a week or at least once a month, depending on usage. This proactive maintenance can significantly reduce the likelihood of the E-22 error appearing.
Can I use chemical drain cleaners for E-22?
No, it is not recommended to use chemical drain cleaners in your Bosch dishwasher. These chemicals can damage internal components, seals, and hoses, potentially leading to more severe issues than the E-22 error. Manual cleaning of filters and hoses is the preferred method.
What if the E-22 error persists after cleaning the filter and drain hose?
If the E-22 error persists after cleaning the filter system and inspecting the drain hose, the issue might be with the drain pump itself, a blocked air gap, or a faulty non-return valve. Further investigation, potentially including accessing internal components, may be required. If you are not comfortable performing these steps, consider contacting a qualified appliance technician.