What does the E19 error code mean on a Bosch dishwasher?

The E19 error code on a Bosch dishwasher indicates a fault with the diverter valve or the internal water softener system. The diverter valve controls water flow direction between the upper and lower spray arms during the wash cycle. When it fails or becomes stuck, the dishwasher cannot distribute water evenly to both rack levels and triggers E19. In some Bosch models this error can also point to a fault in the water softener unit that processes water before it enters the wash chamber.

What is a diverter valve and why is it important?

The diverter valve is a motorized component inside the dishwasher that switches water flow between the upper spray arm and the lower spray arm at different points during the wash cycle. This ensures that both the top and bottom racks receive adequate water pressure and coverage for effective cleaning. When the diverter valve fails, one or both spray arms may not receive water properly, resulting in poorly cleaned dishes on one or both rack levels.

What causes the E19 error on a Bosch dishwasher?

The most common causes of the E19 error include a seized or burned-out diverter valve motor that can no longer switch water flow direction, a position sensor on the diverter valve that is faulty or unable to detect the valve state correctly, limescale or debris buildup inside the diverter valve housing that prevents it from moving freely, a fault in the internal water softener unit caused by a failed regeneration valve or blocked softener resin, or a wiring fault between the diverter valve assembly and the main control board.

How do I fix the E19 error on my Bosch dishwasher?

Start by performing a hard reset: disconnect the dishwasher from power for 5 minutes and restart. If the error returns, check that the dishwasher salt reservoir is filled, as an empty salt reservoir can affect the water softener system and contribute to E19 in some models. Run a descaling cycle to clear any limescale buildup that may be obstructing the diverter valve. If the error persists after these steps, the diverter valve motor, position sensor, or softener unit will need to be professionally inspected and replaced.

How is E19 different from E10, E20, and E24 on a Bosch dishwasher?

E10 is a water supply failure that occurs before the wash cycle begins when the dishwasher cannot fill with water. E20 and E24 are drainage failures that occur after the wash cycle when the dishwasher cannot expel water. E19 is a water distribution fault that occurs during the active wash phase, where water is present in the machine but cannot be directed correctly between the upper and lower spray arms due to a diverter valve or softener system fault.

Can I fix the Bosch E19 error myself?

A hard reset, refilling the salt reservoir, and running a descaling cycle can be done at home and may resolve the error if it is caused by limescale buildup or a low salt level affecting the softener system. However, if the diverter valve motor or position sensor has failed mechanically or electrically, accessing and replacing these components requires disassembling internal parts of the dishwasher and is best handled by a certified appliance repair technician.

Does Promix Appliance Repair fix Bosch dishwasher E19 errors in Boston?

Yes. Promix Appliance Repair provides same-day Bosch dishwasher repair services throughout Boston, Newton, Needham, Brookline, Wellesley, and surrounding areas. Our certified technicians are experienced in diagnosing and replacing faulty diverter valves, position sensors, and water softener components on all Bosch dishwasher models. Call (781) 666-9565 to book a same-day appointment.

(781) 666-9565

E19

Bosch · Dishwasher · Error Code

Bosch Dishwasher E19 Error Code — Water Diverter Valve Error (3-Way Valve)

Tech — Needs Inspection Also shown as: E 19 19

Quick Answer

The E19 error code means the water diverter valve — the 3-way valve that switches water flow between the upper and lower spray arms — is not moving to the correct position when commanded by the control board. A hard reset clears E19 in some cases when a software glitch or stuck valve position is the cause. If the code returns, the diverter valve's solenoid or mechanical gate has failed and needs professional replacement. This is not a DIY repair — the valve is located inside the sump assembly, below the tub floor.

Time

Technician visit

Difficulty

Professional only

DIY Steps

Hard reset only

Repair Cost

$150–$270

What the E19 Code Means

Bosch dishwashers with multiple spray arm zones use a 3-way diverter valve (also called a water distribution valve or zone valve) to direct pressurized water to the correct spray arm at each phase of the wash cycle. Rather than running all spray arms simultaneously at lower pressure, the diverter valve routes the full pump output to one zone at a time — upper rack, lower rack, or the third rack/cutlery tray on models that have one — for more effective cleaning at each zone.

Lower rack zone

Valve routes full pump pressure to the lower spray arm — the main wash zone for pots, pans, and heavily soiled items.

Upper rack zone

Valve switches to route water upward to the mid-level and upper spray arms — for glasses, cups, and bowls on the upper rack.

E19 — valve stuck

The valve's solenoid or mechanical gate has not confirmed the commanded position. The control board detects the mismatch and logs E19.

The diverter valve contains a small solenoid that moves a plastic gate between positions on command from the control board. A position feedback sensor — typically a micro-switch or Hall-effect sensor — confirms the gate reached the correct position. E19 is logged when this confirmation does not arrive within the expected time window: the board commanded a position change but never received confirmation that it happened.

The practical impact: one or more spray arm zones will not receive water during the cycle. If the valve is stuck in the lower-rack position, the upper rack dishes come out uncleaned. If stuck mid-position, both zones receive reduced or no flow. The dishwasher may still appear to run but results will be noticeably poor.

Common Causes — Most Likely First

1

Diverter valve gate jammed by food debris or limescale. A particle of food, broken glass, or limescale buildup has lodged in the valve gate mechanism, physically preventing it from moving to the commanded position. The solenoid energises but the gate cannot travel. Common

2

Failed solenoid coil. The electromagnetic coil inside the diverter valve that moves the gate has burned out or gone open-circuit. The gate receives no force to move regardless of the control board's command. Common

3

Worn or broken gate mechanism. The plastic gate or its drive arm inside the valve has cracked or worn through repeated cycling over years. The solenoid fires but the gate does not move or move fully. Occasional — older machines

4

Failed position feedback sensor. The micro-switch or Hall-effect sensor that reports gate position to the control board has failed. The valve may actually be moving correctly but the board never receives confirmation — it logs E19 based on the missing signal rather than a true mechanical fault. Occasional

5

Wiring harness fault to the diverter valve. The connector or wiring between the control board and the diverter valve solenoid has come loose or corroded, preventing the solenoid from receiving power. Less common

6

Transient software fault / power event. A power fluctuation caused the control board to lose track of the valve's state, logging E19 as a precaution. A hard reset re-initialises the valve position and clears the code with no hardware fault present. Less common — clears with reset

What You Can Try Before Calling — Step by Step

Perform a hard reset — unplug for a full minute

Turn the dishwasher off and unplug it from the wall outlet, or trip its circuit breaker. Wait a full 60 seconds — this discharges the solenoid coil and allows the control board to re-initialize the diverter valve position from scratch on restart. Some E19 faults caused by a transient power event or software state mismatch clear with this step alone.

Note: Unlike E10 or E15, E19 does not have a safe DIY path beyond the hard reset. The diverter valve is located inside the sump assembly beneath the tub floor and is not accessible without disassembling the machine.

Run a full cycle and watch for E19 timing

After restoring power, start a complete wash cycle and watch the display. E19 typically appears early in the wash phase — within the first 3–5 minutes — when the control board first commands the diverter valve to switch zones. If the cycle runs fully without E19, the fault was transient and has cleared.

Also watch: whether dishes on the upper rack come out clean. If the upper rack is consistently coming out dirty or unwashed while the lower rack is clean — or vice versa — the diverter valve is stuck in one position and actively failing, even if the machine isn't always displaying E19.

Note which rack zone is affected

If E19 appears consistently or dishes from one rack zone are uncleaned every cycle, note which zone is affected — upper rack, lower rack, or a specific spray arm. This information helps a technician identify whether the valve is stuck in a fixed position or failing to move at all, and which component is most likely responsible.

Book a professional diagnostic

If E19 returns after a hard reset, book a technician. The technician will access the diverter valve from below the machine, test the solenoid coil resistance with a multimeter, check the harness connector, and verify the position sensor output. On many Bosch models the diverter valve is integral to the sump assembly — diagnosis determines whether the valve alone can be replaced or whether the full sump unit needs renewal.

When to Call a Technician

All persistent E19 faults require professional service. Call us if:

E19 returns after a full 60-second hard reset and a complete wash cycle
The upper or lower rack consistently comes out uncleaned even when E19 is not displayed
E19 appears at the same point in every cycle — the valve is actively failing to switch zones
You hear a clicking sound early in the wash phase that was not there before — the solenoid firing but the gate not responding
E19 appeared immediately after a power outage that also affected other appliances — surge damage to the solenoid winding is possible

Repair Cost Expectations

Hard Reset (DIY)

$0

If a transient fault or power event caused a one-off E19, a hard reset resolves it at no cost. Works in a minority of E19 cases.

Diverter Valve Replacement

$150–$270

Typical Boston-area cost for diverter valve replacement — parts and labor. The valve assembly is $50–$120 depending on the Bosch model series; the rest is diagnostic time and labor to access it in the sump.

E19 Persisting? We'll Replace the Diverter Valve.

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Frequently Asked Questions

What does the diverter valve actually do?

The diverter valve is a motorized 3-way switch inside the sump that routes the wash pump's output to different spray arm zones in sequence. Instead of splitting flow simultaneously across all arms at reduced pressure, the valve directs full pump pressure to one zone at a time — lower rack, then upper rack, then the cutlery tray on models with one. This concentrates cleaning power on each zone, which is why Bosch's zoned washing is more effective than simple split-flow designs.

Will a hard reset fix E19?

In a minority of cases — when a power fluctuation caused the control board to lose track of the valve's last known position — a hard reset re-initialises the valve state and clears E19 permanently. If the valve has a mechanical or electrical fault, the hard reset will not clear E19 because the board will immediately try to move the valve, fail to receive position confirmation, and re-log the fault.

Can I still use my dishwasher with E19?

The dishwasher will attempt to run cycles with E19 but results will be poor. With the diverter valve stuck in one position, only one rack zone receives adequate water pressure — the other zone goes largely unwashed. If food residue from poorly washed dishes sits in the machine between cycles, it also accelerates filter clogging. Resolve E19 before relying on the dishwasher for regular use.

How do I know if my Bosch dishwasher has a diverter valve?

Bosch dishwashers with two or three spray arm zones — upper and lower arm, or upper arm plus a third-rack nozzle — generally have a diverter valve. Most 300, 500, and 800 Series Bosch dishwashers made after approximately 2010 include zone-washing with a diverter valve. If you only have one spray arm visible in the tub, your model may use a different water distribution method and E19 may indicate a different sub-fault — a technician can confirm.

How much does diverter valve replacement cost?

In the Boston area, diverter valve replacement typically runs $150–$270 parts and labor. The valve assembly itself costs $50–$120 depending on the Bosch series — premium 800 and Benchmark Series use a more complex valve at the higher end of that range. The rest of the cost is diagnostic time and labor to pull the machine out, access the sump, and replace the valve.