If your Bosch dishwasher stops mid cycle and shows “Check water supply”, it can be confusing especially when water is clearly entering and the machine works partially before failing.
This type of issue is often intermittent, making it harder to diagnose.
Quick Answer
The most likely cause is a faulty flow sensor (flow meter) that fails to correctly measure incoming water. When the control board can’t detect water flow properly, it stops the cycle.
Step-by-step fix for Bosch “Check water supply” mid-cycle issue
Step 1: Confirm water supply is actually working
Before anything technical:
- Check water tap is fully open
- Ensure inlet hose is not kinked
- Clean the inlet filter screen
👉 Even partial blockage can confuse the system.
Step 2: Understand why the error appears mid-cycle
In your case:
- Dishwasher fills, washes, drains normally
- Then stops during later refill stages
👉 This shows the issue is not basic water supply, but measurement failure.
Step 3: Check the flow sensor (most important step)
The flow sensor tracks how much water enters.
- It uses a small wheel and magnetic reed switch
- Sends pulses to the control board
👉 If pulses are inconsistent, the machine aborts the cycle
Step 4: Test the flow sensor
If you have a multimeter:
- Remove the sensor
- Connect meter to its contacts
- Blow air through it
Expected result:
- Should switch between open (OL) and 0 ohms
- Any resistance or inconsistent reading = faulty
👉 A worn reed switch may work sometimes and fail later.
Step 5: Inspect for cracks or damage
Check physically:
- Cracked sensor housing
- Dirty or corroded contacts
- Loose wiring
👉 Heat can worsen faults, causing failure later in the cycle
Step 6: Replace the flow sensor (recommended fix)
If faulty:
- Replace the entire flow sensor
- Or replace the internal reed switch (advanced repair)
👉 Many users fix this permanently by replacing the sensor.
Step 7: Avoid unnecessary PCB soldering
Resoldering the control board may seem to help temporarily:
- It works briefly
- Then issue returns
👉 This is usually a coincidence, not the real fix.
Extra tips and best practices
- Always clean filters and spray arms regularly
- Use correct water hardness settings
- Avoid repeated partial repairs without diagnosis
- Keep electrical components dry and clean
Common mistakes to avoid
- Assuming it’s always a water supply problem
- Repeatedly resoldering the PCB
- Ignoring intermittent sensor faults
- Not testing with proper multimeter settings
FAQ
Why does my dishwasher stop at different stages each time?
Because the sensor fails intermittently, causing random shutdown points.
Why does it work after I open and reassemble it?
Temporary resets or movement may briefly restore contact, but the fault remains.
Can a faulty sensor cause overfilling?
Yes. Incorrect readings can lead to too much or too little water entering.
Conclusion
If your Bosch dishwasher stops mid cycle with “Check water supply”, the issue is most likely the flow sensor failing to report water intake correctly.
Replacing or repairing the sensor is the most reliable fix. Once resolved, your dishwasher should run full cycles without interruption.
Reference links
https://www.bosch-home.com/us/support
https://www.repairclinic.com/RepairHelp/Dishwasher-Repair-Help
