How to Replace a Bosch Dishwasher Drain Valve for E19 Water Reservoir Error

Error code E19 on a Bosch dishwasher indicates a failure in the water softener drain circuit — specifically, the magnetic drain valve that releases brine during the ion exchange regeneration cycle. This valve (BSH 00631199, also compatible with Bosch-family brands like Neff and Gaggenau since they share the BSH platform) controls when concentrated salt water flushes through the softener resin to recharge it.

When the magnetic drain valve fails, the softener cannot regenerate, leading to increasingly hard water in wash cycles (white film on glasses, mineral spots) and eventually the E19 error code. This guide covers the complete diagnosis and replacement process.

Before You Start

• Tools needed: Torx T20 driver, Torx T15 driver, needle-nose pliers, multimeter, small container for brine, towels, flashlight
• Parts needed: Magnetic drain valve BSH 00631199 (~$25-$50)
• Time required: 25-40 minutes
• Difficulty: Intermediate
• Safety warning: Disconnect power at the circuit breaker. The valve operates at 120V when energized by the control board. Brine from the softener system is concentrated salt water — it will corrode metal surfaces and leave white residue. Clean any spills immediately. Wear gloves to protect skin from concentrated salt solution.

Step-by-Step Instructions

Step 1: Understand What the E19 Error Means

E19 is specific to the water softener subsystem on Bosch dishwashers. It triggers when the control board activates the regeneration cycle but does not detect proper drainage of spent brine. The magnetic drain valve should open to allow brine to flow from the softener unit into the main drain path. If the valve is stuck closed (most common), brine cannot exit and the error triggers.

Step 2: Access the Valve Area

Remove the kick plate from the front base of the dishwasher (2 Torx T20 screws at bottom corners). The magnetic drain valve is located in the base area near the water softener unit — look for a small cylindrical solenoid (about 1.5 inches long) with two thin hoses attached and a 2-pin electrical connector. It is typically mounted on a bracket near the left side of the base (same side as the salt container visible inside the tub).

Step 3: Test the Valve Coil

Disconnect the 2-pin electrical connector from the valve. Measure resistance across the valve terminals with your multimeter: a healthy coil reads 200-500 ohms. If you get open circuit (OL/infinity), the coil wire has burned out — replacement required. If resistance is normal, the valve may be mechanically stuck from mineral deposits — you can attempt cleaning (see troubleshooting) or replace preventively.

Step 4: Check for Mechanical Blockage

With the connector disconnected and hoses still attached, try to manually actuate the valve plunger — on some designs, you can push the center pin to test if it moves freely. If the plunger is seized (calcium deposits from brine crystallization are the usual cause), the valve needs replacement regardless of electrical status. Seized plungers cannot be reliably freed long-term.

Step 5: Disconnect the Brine Hoses

Two small-diameter hoses connect to the valve — one from the softener unit (brine inlet) and one leading to the main drain path (brine outlet). Use needle-nose pliers to squeeze the tiny spring clamps and slide them back. Pull each hose off the valve barbs. Some brine will drip — catch it with a small container or towel. The brine is clear but salty — keep it off metal surfaces.

Step 6: Remove the Mounting Bracket

The valve is secured to the frame with a single Torx T15 screw through a metal bracket, or it snaps into a plastic holder. Remove the screw or release the snap clip. The valve pulls free. Before discarding, compare the old and new valves side by side — verify barb diameters, connector pin spacing, and mounting hole position are identical.

Step 7: Install the New Valve

Secure the new valve in the bracket (Torx T15 screw or snap-in). Connect the hoses: inlet (from softener) to the inlet port, outlet (to drain) to the outlet port. Push hoses fully onto barbs. Slide spring clamps back over the barb ridges. Connect the 2-pin electrical connector — push until it clicks positively.

Step 8: Clear the Error and Test Regeneration

Restore power. Clear E19: press and hold the Start/Reset button for 3-5 seconds. If the error does not clear, disconnect power for 60 seconds (full board reset). To verify the valve works, the softener must perform a regeneration cycle — this typically happens automatically within the next 2-5 wash cycles depending on your hardness setting and usage count. After 3 full cycles without E19 returning, the repair is confirmed successful.

Why BSH 00631199 Is Universal Across Brands

BSH Home Appliances manufactures dishwashers under multiple brand names: Bosch, Siemens, Neff, Gaggenau, and Thermador. They share many internal components including the magnetic drain valve. Part BSH 00631199 fits dishwashers across all these brands that have the water softener system. This is why you may find this part listed with multiple brand names — it is the same physical component regardless of the label on the door.

Troubleshooting: Valve Cleaning Attempt

If the coil tests good electrically but the valve is mechanically stuck:

1. Remove the valve completely
2. Submerge in white vinegar for 4-6 hours
3. After soaking, flush with clean water
4. Apply 120V briefly (with a test lamp in series for safety) — listen for a click
5. If it clicks and allows flow, reinstall and test
6. If still stuck, replace — the plunger bore is too corroded for reliable operation

Note: cleaning provides a temporary fix at best. The mineral deposits will return within months. Replacement provides long-term reliability.

When to Call a Professional

Consider professional help if:

• You are unsure whether your model has a water softener (not all Bosch dishwashers do)
• E19 persists after valve replacement — the control board's regeneration timing circuit may be faulty
• Brine has leaked from the valve into the base pan, triggering E15 (AquaStop) — both the valve and the flood damage need addressing
• The softener resin tank itself is damaged, leaking resin beads into the wash system

Cost Comparison: DIY vs Professional

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FAQ

Q: Is the E19 error dangerous or can I keep using my dishwasher? A: E19 is not dangerous — your dishwasher will still wash dishes. However, without softener regeneration, you will gradually see increased mineral deposits on dishes and glassware, and limescale buildup inside the machine. Long-term, this reduces cleaning performance and accelerates component wear. Fix it within a few weeks.

Q: Can I disable the water softener to stop E19 errors? A: On some models, setting the water hardness to 0 (zero) disables the softener system and stops regeneration attempts, which prevents E19. However, you lose the water softening benefit — dishes will show hard water spots. This is an acceptable workaround if your area has soft water and the softener was unnecessary.

Q: Why does my Bosch dishwasher have a water softener when American brands don't? A: Bosch is a German company and in Europe, built-in water softeners are standard because many regions have very hard water (20+ GPG). The design carries over to some US models. American brands typically omit the softener to reduce cost, relying on rinse aid and consumer water softeners instead.

Q: How do I know the regeneration cycle is working after valve replacement? A: You will notice: glasses come out clearer (fewer mineral spots), the salt level in the container decreases over time (salt is being consumed), and you may hear a brief extra water flow sound at certain points in the cycle (brine being flushed through the resin). Most importantly: E19 does not return.

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