Gaggenau DF 260 Notice D'utilisation page 18

Limescale and contaminants in the rinsing water may block nozzles
and bearings on the spray arms. Using the water softening system may
reduce this.
Check outlet nozzles on the spray arms for blockages.
Unscrew the upper spray arm.
Remove the lower spray arm.
block the waste water pump. The rinsing water does not get pumped
Disconnect the appliance from the power supply.
Scoop out water, use a sponge if required.
Using a spoon, pry off pump cover(as illustrated) until it clicks, then
then pull it out forwards.
Check inner compartment and remove any foreign objects.
Place cover in the original position, press down and engage.
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