Bosch Dishwasher Service Test Result 4: Water Filling

What 4 means

On an older Bosch dishwasher, a 4 in the service test means the water-filling problem, the same group the machine shows an owner as one letter: no fill, overfill, underfill, or water pooling in the base. Because results are summed, a 6 means this problem together with the heating one. It usually boils down to supply, valve or leak.

Common causes of 4

Fill screen blocked, or supply stop part closed
Inlet valve leaking through or not opening
Base float switch tripped by pooled water

✓ One safe check you can try

1. If you see any water in the base, close the supply stop under the sink. 2. Look over the fill hose for a kink. 3. Unscrew the hose where it meets the stop and rinse the mesh screen inside its fitting. 4. Reconnect and run a short test cycle.

! Why to stop there

Water in the base can leak onto flooring and reach wiring.
A float switch is tripped by water, so it points to a leak that needs finding.
Swapping the inlet valve without checking the screen can be unnecessary.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other Dishwasher codes

E:30Bosch Dishwasher E:30, voltage too high and the machine shut down E:31Water in the zeolite container - Bosch Dishwasher E:31 FBosch Dishwasher F on an older display (water filling) 2HBosch Dishwasher 2H: Long Cycle Warning on Older Displays 1Bosch Dishwasher Service Test Result 1: Aqua Sensor 2Bosch Dishwasher Service Test Result 2: Heating Group 8Bosch Dishwasher Service Test Result 8: Temperature Sensor 16Bosch Dishwasher Service Test Result 16: Spray Diverter

44 questions

Does a 6 mean something different?

It means the filling problem and the heating problem together, since the numbers add. We address each separately, starting with whichever one affects safety first, which is usually any water in the base.

How do I know if water is in the base?

You may see dampness around the dishwasher, or the float switch may stop the cycle. We check the base and trace the source of any water.

Can I run the machine while waiting for repair?

If water is collecting in the base, no. Close the supply valve and leave it off. If it is only a fill problem, short use is fine, but cycles may stop.