When a Bosch dishwasher shows power but won’t start, check the door latch, control lock, water supply, and leak sensor before replacing parts.
If the lights come on yet the cycle never kicks off, you’re close to a solution. Most no-start problems on these machines trace back to simple settings, a safety interlock, or a blocked water path. This guide walks you through fast checks first, then deeper tests. You’ll get clear steps, parts to inspect, and when it’s smarter to call a pro.
Bosch Dishwasher Has Power But Won’t Run — Quick Wins
Start with the items you can rule out in minutes. Many callouts end up being a latched door that isn’t quite seated, an active child lock, or a delayed start timer left from last time.
| Symptom | What To Check | Likely Fix |
|---|---|---|
| Buttons respond but Start does nothing | Door not fully latching; strike misaligned | Press door firmly; adjust strike; clear racks from the seal area |
| Control beeps or shows a key icon | Child lock / control lock active | Hold specified keys to turn off the lock (model-specific) |
| Display shows a tap/faucet symbol | Low inlet flow or closed supply valve | Open valve fully; unkink hose; clean inlet screen |
| Machine hums, pump runs, no fill | Leak tray float triggered (E15 on many models) | Address leak, drain base, reset after drying |
| Panel lights but won’t accept inputs | Control lock or cycle paused | Disable lock; cancel and reselect cycle |
| Starts only when pushing door inward | Loose latch micro-switch | Adjust or replace latch assembly |
| Starts once, then stops at fill | Clogged inlet screen or weak pressure | Clean screen; confirm 20–120 psi at tap |
Confirm The Basics
Ensure The Door Latch Is Truly Engaged
Close the door with a firm push. Listen and feel for a positive click. If the tub lip has a utensil or an overfilled rack nudging the seal, the latch switch won’t close. Pull racks back an inch and try Start again. If pressing the door inward makes it run, realign the strike plate or replace the latch.
Disable The Control Lock
These models include a control lock that blocks all inputs. If a small key icon appears or the buttons beep without starting, hold the labeled keys for a few seconds to turn it off. Exact buttons vary by model; Bosch outlines the pattern on its support pages and in the manual. You can reference Bosch’s child lock guide for examples.
Cancel Any Delay Start
If Delay is lit, the unit is waiting for the timer to count down. Cancel the delay (usually by pressing the Delay button until it clears or holding Start to reset), then select a cycle and press Start.
Rule Out Water Supply Stoppers
Even with lights on, the cycle won’t begin if the control doesn’t detect fill. That’s why a low-flow inlet or a closed valve can look like an electrical issue.
Open The Supply Valve Fully
Trace the braided hose to the shutoff under the sink. Turn it fully counter-clockwise. Check for kinks or crushing behind the cabinet. If your display shows a tap/faucet icon, Bosch’s official steps point to flow checks and screen cleaning. See the brand’s page on the water tap symbol.
Clean The Inlet Screen
Shut water off, unscrew the hose at the machine end, and pull the mesh filter from the valve with needle-noses. Rinse debris and reinstall. Restore water and test.
Check For Leak-Protection Lockout
Many units use a float in a bottom tray to stop operation when water collects in the base. The control may display E15 or just refuse to start while a small drain pump runs. Bosch documents E15 as water detected in the base; fixing requires drying the tray and correcting the leak source before a reset. Review Bosch’s guidance on E15.
How To Clear A Triggered Float
- Disconnect power at the plug or switch.
- Pull the unit forward a few inches to inspect the base tray.
- If water is present, sponge it out and let the area dry fully.
- Inspect hose joints, the circulation pump seal, and the water inlet for drips.
- Reassemble, restore power, and start a quick cycle while watching underneath.
If water returns to the tray, repair the leak before further use.
Reset The Control Cleanly
A simple cancel can free a stuck program. On many models, hold Start for 3–5 seconds to abort and drain. Then power-cycle at the wall switch or plug for one minute. Reapply power, choose a basic program, and press Start once. Bosch’s main troubleshooting hub covers these basics along with model-specific tips.
Deeper Diagnostics When Fast Checks Don’t Work
At this point you’ve cleared the usual setting and supply problems. Next up: interlocks, sensors, and power at the right spots. These steps take a bit more care. Unplug or switch off power before opening any panels.
Test The Door Latch Switch
Remove the inner door panel to access the latch assembly. With a multimeter, confirm continuity across the switch when the latch is closed. No continuity with the latch engaged means a failed switch or misalignment. Replace the latch assembly as a unit if the micro-switch is riveted.
Inspect The Control For Stuck Keys
Front panels can collect moisture. If a specific button never registers, the tactile pad or ribbon may be oxidized. Reseat the ribbon cable. If multiple keys fail, the user interface board may need replacement.
Verify Water Inlet Valve Operation
With power off, ohm the coil; many valves land in the hundreds of ohms range. With power on during fill, the coil should receive line voltage briefly. Coil in-range with no fill points to clogged plumbing; no voltage points back to the control or a safety lockout.
Look For A Stuck Drain Pump
If the drain pump runs constantly, the control won’t progress to fill. That can be a leak-tray float or debris jam. Clear the sump area, then check the float condition again.
Model-Specific Clues That Save Time
Key Icon Or “CL” On Display
That’s the control lock. The brand shows several unlock patterns across models; the UK and Singapore support pages demonstrate common combinations. If the machine ignores presses or beeps at you, use the unlock sequence for your layout.
Tap/Faucet Symbol With No Fill
This points to low water flow or a blocked screen at the inlet valve. The official steps: open the valve, unkink the hose, clean the screen. If pressure at the tap is weak, restore supply before retesting.
E15 With A Running Drain Pump
Water in the base tray triggers a safety shutoff. Dry the tray, then fix the leak before restarting. Bosch’s E15 page outlines this behavior and the remedy.
Safe Approach To Pulling The Machine
When you need to access the sides or the base, kill power at the switch or breaker and shut the water valve. Slide the dishwasher straight out to avoid bending the copper or braided hose. Have towels ready in case the hose drips. Never tip a unit that might have water in the base tray; that can spill onto wiring and cause new faults.
When A Technician Makes Sense
Call for service if the latch switch tests fine, the lock is off, water supply is strong, and there’s no water in the base tray. Common pro fixes at this stage include a failed user interface, a control board with a weak relay, a faulty inlet valve coil, or a damaged wiring harness in the door bend. If you’re still under warranty, book a visit through the maker’s service portal.
Parts And Tools You May Need
A short list keeps the job moving. Keep these on hand before you start deeper checks.
- Torx drivers for inner door screws
- Needle-nose pliers for the inlet filter
- Multimeter with continuity and resistance
- Flashlight and towels
- Replacement latch assembly and/or inlet valve if testing confirms failure
Step-By-Step: From Zero To Start
- Power and settings: confirm no Delay, disable control lock, select a basic program.
- Door: remove obstructions at the seal, close firmly, listen for the click.
- Water: open the shutoff, straighten the hose, clean the inlet screen, check pressure.
- Leaks: pull the unit slightly, check the base tray; dry if wet and find the source.
- Reset: hold Start to cancel, then power-cycle for one minute.
- Test: start a short cycle with the door closed without pushing on it.
- Measure: if still no start, test latch continuity and inlet valve coil resistance.
Second Reference Table: Symptom-To-Part Map
| Finding | Probable Part | Next Step |
|---|---|---|
| No continuity when latch closed | Door latch switch/assembly | Replace latch; re-align strike |
| Key icon; buttons ignored | Control lock engaged | Use unlock combo from support page |
| Tap symbol; fill never starts | Inlet valve or clogged screen | Clean screen; test valve coil; replace if weak |
| Drain pump runs constantly | Base float switch triggered | Dry base; fix leak; reset |
| Front keys intermittent | User interface board | Inspect ribbon; replace UI |
| Valve coil in-range; no power during fill | Main control board | Professional diagnosis recommended |
Care Habits That Prevent Repeat No-Starts
Keep The Inlet Path Clean
Mineral grit builds up at the screen and the faucet aerator. A quick rinse every few months protects fill reliability.
Mind The Racks When Loading
Utensil handles that stick past the rack can nick the door seal or block the latch from seating. Keep tall items inside the rack frame.
Watch For Small Drips Early
A teaspoon in the base tray is enough to trigger the float. If you see moisture below the door, address it right away so you don’t run into another lockout. Bosch’s E15 note explains why the safety stops everything until the base is dry.
Where Official Help Lives
Two links worth saving: the brand’s page on dishwashers that won’t start and the owner support troubleshooting hub. Both outline model-specific icons and steps that match the panels you see at home.