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Remove the level detection
Unscrew both screws (TX25).
Pull the probe out with bracket.
Repeat the procedure for the second probe.
Dismantle the lockable cover and flap
Open both quick-release closures.
Remove the lockable cover with motor.
Pull off the retaining clip and remove the backwater
flap.
Drain and check the backflow preventer
2. Open the one-handed closure on the flap housing.
Remove the pressure pipe connection.
Use a narrow object to lift the backflow preventer and
allow the wastewater to flow into the open tank.
If there is no water in the pressure pipe, dismantle the
backflow preventer (4 screws), check it and replace it if
necessary.
Installation and operating instructions
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