How to replace the sump drain hose on a Bosch dishwasher

Is your Bosch dishwasher leaking water onto your kitchen floor? A cracked or damaged sump drain hose could be the culprit, but don’t worry—fixing it is easier than you think! Watch the how-to video below to learn the simple steps to replace your sump drain hose and keep your dishwasher running smoothly.

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On a Bosch dishwasher, the sump drain hose connects the sump to the dishwasher’s drain hose. Over time, this hose may become worn, cracked, or damaged, leading to water leaks under the dishwasher. Replacing the sump drain hose is a relatively quick and straightforward repair that you can do yourself. So, let’s get started and learn how to replace the sump drain hose on your Bosch dishwasher.

Watch here: How To: Bosch/Thermador/Gaggenau Sump Drain Hose 00645149

The information in this article may not apply to your specific appliance model. We recommend consulting your manufacturer’s documentation or contact us with any questions.

Tools needed 

• Phillips screwdriver
• 5/8″ wrench
• 5/16″ nut driver
• Short flathead screwdriver
• Long flathead screwdriver
• Towel
• Container

Safety precautions

• Always power off and unplug your appliance or switch off the circuit breaker before attempting any maintenance or replacement work. This keeps you safe by preventing any risk of injury from electric shock.
• Turn off the water supply at the outlet before beginning repairs to any appliance parts that hold water. Have towels ready for any residual water in the system when removing parts. 
• Wear insulated work gloves to protect your hands from sharp metal parts, pinching hazards and debris.
• Don’t test wiring with a multimeter for live voltage if you’re unfamiliar with how to prevent short circuiting when testing. 
• When working with wires, avoid touching any exposed wires or terminals. If you need to touch a wire, use a non-conductive tool or wear insulating gloves to prevent electrical shock.
• Take your time and don’t rush while working to prevent accidents and personal injuries.
• Work in a well-lit area so you can clearly see and access the interior parts.
• Clear your workspace of clutter and other obstacles. Keep children and pets away from the work area.
• Never work on internal parts with bare wet hands. Make sure the work area is completely dry.
• Check your user manual to see if there are specific installation or safety instructions for your part or appliance. 
• Be gentle when handling or removing parts. Excessive force might damage the appliance or cause injury.
• Wear safety glasses when working with chemicals, dust or cleaning large debris to prevent injury. 
• If the appliance has recently been used, give it plenty of time for any heating parts to cool down before working on it. 

Replacement steps

Disassembly

1. Open the door of the dishwasher. Using a Phillips screwdriver, remove the two screws on the mounting brackets that secure the dishwasher to the countertop or cabinet.
2. Take out the two screws on the sides of the bottom kickplate access panel and remove the access panel.
3. Place a towel and a plastic container under the shut-off valve at the sink to catch any water that might be in the water lines.
4. Using a 5/8 open-ended wrench, disconnect the water line from the shut-off valve.
5. Using a 5/16 inch nut driver, loosen the hose clamp and remove the drain hose from the air gap or garbage disposal.  
6. Pull the dishwasher out and place a towel on the floor under the drain hose at the back of the dishwasher.
7. Locate the retaining bracket where the drain hose meets the sump drain hose.
8. Using a small flat blade screwdriver, loosen the hose clamp and pull the drain hose off. Be prepared to catch any wastewater.
9. Push and unlock the tab, and remove the sump drain hose from the retainer.
10. Pull the sump drain hose out of the bottom retainer and place a towel on top of the dishwasher.
11. Carefully tilt the dishwasher back.
12. Move to the front of the dishwasher and use a flat blade screwdriver to pop the plastic clamp off. Pull the hose out of the sump.
13. Remove the hose from the side retaining clips.

Installation

1. Insert the end of the new sump drain hose into the support at the left side.
2. Insert the right side of the hose with the rubber seal into the sump opening as far as it can go.
3. Install the plastic lock clamp to secure the connection.
4. Run the new sump hose under the dishwasher and into the side retainers.
5. Insert the other end of the sump drain hose into the rear retainer opening and close the tab to secure it.
6. Lower the dishwasher back into its original position.
7. Connect the drain hose to the sump hose and use a small flat blade screwdriver to tighten the clamp.
8. Reinstall the dishwasher under the counter.
9. Pull the drain hose, inlet hose, and power cord through the hole.
10. Reconnect the water line onto the shut-off valve and tighten it using a five-eighths open-ended wrench.
11. Connect the drain hose to the air gap or disposal and tighten the clamp with a five-sixteenths-inch nut driver.
12. Open the dishwasher door and secure the dishwasher to the countertop or cabinet using the two mounting brackets and Phillips screws.
13. Install the access panel and secure it with the two Phillips screws.
14. Turn on the water supply, plug in the dishwasher, and run a test cycle to check for any leaks.

Additional information

Thanks for reading! We hope this guide helped you replace the sump drain hose on your Bosch dishwasher. 

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