Quick Answer: Why Your Bosch Dishwasher Will Not Fill#
Most likely: the simplest cause — the under-sink supply valve is closed or only partway open — or the AquaStop safety valve in the supply hose is not opening. Bosch is unusual because water must pass through two valves to reach the tub: the electrically-controlled AquaStop in the hose, then the machine's own inlet valve. After those, a clogged inlet screen, a burned-out inlet-valve solenoid (E03), a control board not commanding fill, or an active E15 flood lockout are the remaining causes. Work the fill path in order rather than guessing.
Likely Causes at a Glance#
| Cause | Likelihood | What to check |
|---|---|---|
| Supply valve closed or partly closed | Most likely | the under-sink angle stop; handle should be parallel to the pipe, fully open |
| AquaStop valve not opening | Common | listen for its click at cycle start; a red indicator in the hose window means it tripped |
| Inlet-valve solenoid failure (E03) | Common | meter each solenoid coil — 500–2000 ohms; open circuit means a burned-out coil |
| Inlet screen clogged | Common | the mesh screen at the valve inlet coated with mineral scale, especially in hard water |
| Control board not signaling fill | Occasional | valve tests good and screen is clear, but no click and no fill at cycle start |
| E15 flood lockout | Rare | water in the base pan forces AquaStop shut as flood protection; clear E15 first |
Do You Have the Right Tools?
Water pressure gauge ($60), spray arm tester, float switch multimeter ($85), and drain inspection camera. Our technician arrives with $3,000+ in professional tools — your diagnostic is free.
Licensed & Insured · 90-Day Warranty · Same-Day Service
Walking Through the Diagnosis#
Shut off the water supply and disconnect power before opening any connection. Start at the wall: confirm the under-sink supply valve is fully open, since it is the single most common cause and is easily left closed after plumbing or sink work. Next, start a cycle and listen — a healthy AquaStop clicks as it energizes and you should hear water begin to flow. No click and no flow points at the AquaStop hose: check that its electrical connector (usually left side, behind the access panel) is secure, and meter the solenoid at 500 to 2000 ohms; an open coil or a mechanically stuck valve means replacing the whole hose assembly. If AquaStop has a red indicator showing in its window, it has tripped as a safety measure.
If you hear the click but no water arrives, the inlet screen or inlet valve is the suspect. Place a towel under the connection, remove the supply hose from the inlet valve with a 10mm wrench, and inspect the mesh screen — scale from hard water (Sacramento and Bay Area supplies run high) blocks it over time. Clean it with a toothbrush under running water or soak it in white vinegar for 20 minutes. If the screen is clear, meter the dual-solenoid inlet valve (Bosch part 00622058): 500 to 2000 ohms per coil, with an open reading condemning it — and an E03 code specifically flags this solenoid failure. When the valve clicks with the connector attached but still passes no water, or everything upstream tests good, the control board is not sending the fill command. Finally, if an E15 is displayed, the base pan has water and AquaStop is holding the fill closed on purpose; find and fix that leak, drain the pan, and clear E15 before fill will resume.
Repair or Replace? The Short Version#
Opening a supply valve or cleaning a screen costs nothing, and an AquaStop hose or an inlet valve is an inexpensive part on a Bosch worth keeping. Only a control board pushes the cost up, and even that stays well under a new dishwasher. Because a no-fill often coexists with a leak (the E15 case), it is worth diagnosing correctly rather than swapping parts. If metering the AquaStop solenoid or chasing a control-board signal is not for you, our technicians know the Bosch fill path and confirm the cause first — book a repair.
Safety First — Know the Risks
Live 120V wiring in a wet environment is one of the most dangerous DIY scenarios. Water + electricity = serious shock risk. Our techs are licensed and insured — let them handle the risk.
Licensed & Insured · 90-Day Warranty · Same-Day Service
Frequently Asked Questions#
What should I check first when my Bosch dishwasher will not fill?#
The under-sink supply valve — it is the most common and simplest cause, and it is easy to leave closed after plumbing work. Confirm the handle is parallel to the pipe (fully open), then start a cycle and listen for the AquaStop click and for water flowing before you open the machine.
What does a red indicator in the AquaStop hose mean?#
The AquaStop safety valve has tripped and shut off the water — usually because it detected a leak or the base pan holds water (an E15 condition). The dishwasher will not fill until you resolve the leak, drain the base pan, and reset the fault; then the valve reopens on command.
What is E03 on a Bosch dishwasher?#
E03 flags an inlet-valve fill fault, typically a burned-out solenoid coil on the dual-solenoid inlet valve (part 00622058). Meter each coil — a good coil reads 500 to 2000 ohms, and an open circuit means the coil has failed and the valve needs replacing.
Could hard water be why it stopped filling?#
Yes. The mesh inlet screen catches mineral particles, and in hard-water areas it can scale over until almost no water passes even with the valves working. Remove the supply hose at the inlet valve, clean the screen with vinegar or a toothbrush, and reinstall it.
Appliance Repair Technician · 8 years experience
Experienced technician with 8 years specializing in dishwasher repairs and European appliance brands including Bosch and Thermador.
