How to Replace 00425458 Water Inlet Valve on Bosch Dishwasher — Step-by-Step

Your Bosch dishwasher won't fill with water. You hit the start button, hear a hum, but no water comes in. Or worse — there's a puddle under the dishwasher spreading across your kitchen floor. Nine times out of ten, you're looking at a failed water inlet valve, and the 00425458 is one of the most common replacement parts for Bosch, Thermador, and Gaggenau dishwashers.

This valve controls water flow into your dishwasher. When it fails, you'll either get no water at all or water leaking from the connection point. The good news? This is a straightforward repair that doesn't require dismantling your entire dishwasher.

What You Need Before Starting

Gather these tools before you begin:

• Adjustable wrench or channel locks
• Phillips screwdriver
• Flathead screwdriver
• Towels (for water cleanup)
• Small bucket or bowl
• Flashlight

Repair Time: 30-45 minutes

Difficulty: Moderate

Safety First

Turn off power to the dishwasher at your circuit breaker — not just the door switch. Then shut off the water supply valve under your sink. This valve usually has a quarter-turn handle or a round knob. If you can't find a dedicated dishwasher shutoff, you'll need to close your home's main water valve temporarily. Have towels ready because residual water will drain when you disconnect the old valve.

Step 1: Access the Water Inlet Valve

The water inlet valve sits at the bottom front of your Bosch dishwasher, behind the lower kickplate panel. Remove the two screws at the bottom corners of this panel — they're usually Phillips head. Pull the panel forward and down to release it. You'll see the valve on the left side where the water supply line enters the dishwasher. It's a brass or plastic component about the size of your fist with electrical wires connected to solenoid coils on top.

Step 2: Disconnect Water Supply and Electrical

Place your bucket under the valve to catch residual water. Use your adjustable wrench to loosen the compression fitting where the water supply line connects to the valve — turn counterclockwise. Water will drip out, so keep that towel handy. Once the supply line is free, disconnect the wire harness from the valve's solenoid coils. Press the tab on the connector and pull straight out. Some models have two separate wire connections — note which wire goes where, though most are keyed and won't fit wrong.

Step 3: Remove the Old Valve from the Dishwasher

The inlet valve connects to your dishwasher's internal hose with either a clamp or another threaded fitting. If it's a hose clamp, use your flathead screwdriver to loosen it and slide it down the hose. If it's threaded, turn counterclockwise with your channel locks. Pull the old valve free — more water will drain from the internal hose, so keep that bucket positioned underneath. Inspect the old valve's inlet screen for debris or mineral buildup. This is what failed and caused your no-fill or leak issue.

Step 4: Install the New 00425458 Valve

Check that the inlet screen on your new 00425458 valve is clean and properly seated. Connect the valve to the dishwasher's internal hose first — if it uses a clamp, slide the clamp over the hose before pushing the valve in, then tighten the clamp securely. If threaded, hand-tighten then snug with channel locks. Don't overtighten brass fittings. Now reconnect your water supply line to the valve inlet using your wrench — hand-tight plus a quarter turn is sufficient. Reconnect the electrical connector(s) until they click into place.

Step 5: Test for Leaks and Operation

Before you replace the kickplate, turn the water supply back on slowly and watch for leaks at both connections. Tighten slightly if you see drips. Turn the power back on at the breaker. Start a rinse cycle and watch the valve through the open kickplate — you should hear clicking as the solenoids open and water should flow into the tub within 30 seconds. Let it run for 2-3 minutes while you inspect all connections with your flashlight. Once you're confident there are no leaks, shut off the cycle and replace the lower panel.

Testing After Installation

Run a complete wash cycle while you're home. Check under the dishwasher midway through the cycle and again at the end. The valve opens multiple times during a cycle — initial fill, rinse fills, and final rinse. If you notice any moisture, you'll catch it early. Also verify the dishwasher is filling to the proper level — you should see water just touching the heating element at the bottom of the tub during the wash cycle.

Frequently Asked Questions

Will this valve work on my Thermador or Gaggenau dishwasher?

Yes, the 00425458 is used across multiple BSH brands including Bosch, Thermador, and Gaggenau. It replaces part numbers 00167081, 00189533, and 00580009. Check your model number against the compatibility list — it fits dozens of models from the SHU, SHV, SHX, and SHE series Bosch dishwashers manufactured in the last 15 years.

Why is my dishwasher leaking from the inlet valve area?

Leaks typically occur at three points: the water supply connection (loose fitting or worn ferrule), the internal hose connection (failed clamp or cracked hose), or through the valve body itself (failed solenoid seal). If tightening connections doesn't stop the leak, the valve body has failed internally and needs replacement. This is common after 7-10 years as mineral deposits damage the internal seals.

Can I clean the old valve instead of replacing it?

If your dishwasher won't fill, you can try cleaning the inlet screen — remove the valve, pull out the small plastic screen, and rinse it under water. However, if the solenoid coils have failed (you'll hear humming but no clicking), or if the valve is leaking from the body, cleaning won't help. The 00425458 valve has dual solenoids that control hot water input for different cycle stages, and these electrical components can't be repaired once they fail.