Hansgrohe Pontos AquaCycle 900 Instrucciones De Servicio página 77

Checking "minimum fill level exceeded":
If the stage, the sensor of which you would like
to check, already contains water and the right
hand and left hand electrode extend into the
water, a "1" for minimum level must be depicted
in the menu Status display fill levels.
If the right hand and left hand electrode do not
extend into the water, you may bridge the elec-
trodes (touch right hand and left hand electrode
simultaneously with a wire), in this way check-
ing their function. If you short-circuit the elec-
trodes, the status display fill levels must indi-
cate a "1" for minimum level. If that is not the
case, check the contacts and cables.
If the display continues to signal fill level rea-
ched ("1"), although there is no water in this
stage, check the contacts and cables. In addi-
tion, ensure that the electrodes do not touch at
their lower end.
Replacement display module
1. Unplug the facility's mains plug.
2. Carefully disconnect plug-and-socket con-
nections from the printed circuit board.
3. Unscrew fastening screws (4x recessed
head screws) and remove printed circuit
board.
4. Mount the new display module in reverse
order.
5. Restore plug-and-socket connections
Disconnecting the plug-and-socket connections
050608
Unscrewing the fastening screws
Replacing the I/O printed circuit board
1. Unplug the facility's mains plug.
2. Carefully pull out all plug-and-socket con-
nections at the printed circuit board.
3. Unscrew protective earth conductor con-
nections from the terminals using an actu-
ating tool.
4. Unscrew fastening nuts (5.5 mm socket
wrench) and remove printed circuit board.
5. Mount the new printed circuit board in re-
verse order.
6. Restore plug-and-socket connections ac-
cording to marking.
Unscrewing the fastening nuts
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