Dennerle 588 Comfort Bedienungsanleitung Seite 17

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5 Warning indicators / fuses
5.1 The pH display flashes
The pH value in the aquarium deviates more than + 0.5 or - 0.5 from the set value.
Check the system immediately:
• Is there CO still in the cylinder?
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• Has the number of bubbles/minute been set correctly?
• Should the pH value be too high, the bubble output/minute may be too low.
• Should the pH value be too low, the bubble output/minute may be too high.
• Recalibrate the pH sensor.
5.2 Fault indicator
In case of a technical defect the pH-Controller will switch the solenoid valve off. The
display will show the fault as follows:
Fault Cause of fault
F 1 Calibration unsuccessful.
Respective LED still burning:
•Calibration solution bad/too old
•Sensor immersed in the wrong calibration
solution and/or wrong push button for
calibration pressed.
•Interruption of the calibration process
by pressing another push button
(e.g. pressing pH 4 whilst calibration pH 7)
•Sensor dirty
•Sensor used up or broken
F 9 Appliance defect
5.3 Fuse replacement
Should the connected solenoid valve fail to open, although the LED indicates it is switched on,
either the solenoid valve is defect or the fuse.
Replace the fuse: Disconnect the pH-Controller from the power supply. Unscrew the fuse hol-
der (left) and remove the defective fuse
and replace the fuse holder.
5.4 Power failure / long-term memory of set value
In case of a power failure the long-term memory will maintain the set pH value. As soon
as power is supplied again to the pH-Controller, it will automatically start adjusting the
pH value in the aquarium to the set value.
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. Insert a new, identical fuse (electrical supply store)
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Use new calibration solution.
Restart calibration.
Repeat calibration starting with
pH 7
Repeat calibration starting with
pH 7
Clean sensor, resp. regenerate
(refer to 2.5 and 2.6)
Connect new sensor.
Calibrate additionally after
one week of use.
Ship the appliance to the
DENNERLE service depart-
ment for a check-up.