Bosch Dishwasher E19: Replace the Drain Valve

Bottom line: An E19 error on a Bosch dishwasher points at the magnetic drain valve on the water-softener circuit, usually stuck closed by mineral crystals. Replacing it is an intermediate 25-40 minute job; test the coil first so you are not swapping a good part.

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.

Tools and parts#

Step by step#

1. Understand the E19 error#

E19 is specific to the water-softener subsystem. It fires when the control board starts a regeneration cycle but never sees the spent brine drain. The magnetic valve should open to let brine flow from the softener into the main drain path, and when it sticks closed — the common case — the brine cannot leave.

2. Reach the valve#

Remove the kick plate from the front base (two Torx T20 screws at the bottom corners). The valve is a small cylindrical solenoid about 1.5 inches long with two thin hoses and a 2-pin connector, mounted on a bracket near the softener unit on the left side of the base.

3. Test the valve coil#

Unplug the 2-pin connector and measure resistance across the valve terminals. A healthy coil reads 200-500 ohms. An open circuit means the coil has burned out and the valve needs replacing. Normal resistance instead points to a mechanical seizure you can sometimes clean.

4. Check for a mechanical seizure#

With the connector off and hoses attached, try pushing the center plunger pin on designs that allow it. A plunger seized by calcium crystals from the brine needs replacement regardless of what the coil reads, since a stuck plunger cannot be reliably freed for long.

5. Disconnect the brine hoses#

Two small hoses meet the valve — one brine inlet from the softener, one outlet to the drain. Squeeze the tiny spring clamps with needle-nose pliers, slide them back, and pull each hose off its barb. Expect a little brine, so keep your container or towel ready; it is clear but salty.

6. Remove the mounting bracket#

The valve is held by a single Torx T15 screw through a metal bracket, or it snaps into a plastic holder. Back out the screw or release the clip and pull the valve free. Before discarding, set the old and new valves side by side and confirm the barb diameters, pin spacing, and mounting holes match.

7. Install the new valve#

Secure the new valve with the Torx T15 screw or snap-in, then connect the hoses — inlet from the softener to the inlet port, outlet to the drain port — pushing each fully onto its barb and sliding the spring clamps back over the ridges. Reconnect the 2-pin connector until it clicks.

8. Clear the error and test#

Restore power and clear E19 by holding Start/Reset for 3-5 seconds; if it will not clear, cut power for 60 seconds for a full board reset. To confirm the valve works, the softener has to run a regeneration cycle, which happens automatically within the next 2-5 wash cycles depending on your hardness setting and usage.

If E19 comes back#

• Still erroring after the swap: confirm the new valve's coil reads 200-500 ohms and the hoses are on the correct ports.
• You can accept spots: setting hardness to 0 disables the softener and stops regeneration attempts, which suppresses E19 but leaves mineral spots.
• Repeated codes plus leaks: a related E15 base-tray flood switch may be tripping — check the base for water.

When to call a pro#

Board-level faults or a base that keeps filling with water need a technician. See our dishwasher repair cost guide or book a same-day repair.