Bosch dishwasher filling and draining constantly?

That does sound very much like the anti-flood system has been triggered, or the machine thinks it has. On Bosch dishwashers this often happens if water has collected in the base tray, but there are a few things worth checking first.

1. **Switch off and isolate it from the mains** Before removing panels or pulling it out, disconnect the appliance from the electricity supply and turn the water off.

2. **Check for water in the base tray** Pull the dishwasher out and gently tilt it slightly backwards or sideways over some towels. If water runs out from underneath and it then works again, the anti-flood float has likely been activated. That points to a leak, not just a one-off fault.

3. **Look for obvious leak sources** Check: - Door seal for damage or dirt - Lower spray arm for splits or blockage causing water to spray at the door - Filters correctly fitted - Overfoaming from using the wrong detergent or rinse aid overdose - Fill hose and drain hose connections

4. **Check the drain hose installation** If the drain hose is too low or badly routed, it can sometimes cause filling/draining issues. Make sure it rises up correctly under the worktop before going to the sink waste.

5. **Listen to when it starts** If it starts draining immediately even when dry underneath, the float switch, pressure system, or control may be at fault rather than an actual leak.

If drying the base gets it going, watch closely for where the leak returns from. If you need internal electrical testing or strip-down work, it’s best left to a qualified appliance engineer. Avoid any mains or sealed component work unless properly trained.

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