24
MALFUNCTIONS
MALFUNCTIONS AND ERROR MESSAGES
If the controller detects a malfunction, the red LED blinks
and the warning symbol appears on the display.
If the malfunction resolves itself, the warning symbol be-
comes an information symbol and the red LED stops blin-
king.
To view details of the error, press the key under the war-
ning or information symbol.
b
End users must not attempt to resolve malfunctions
in person. Always refer malfunctions to specialist
personnel!
esc
(Flashing LED +
error message)
Possible error messages
Note for service personnel
Sensor x error
This means that there is/was a fault in the sensor, input to the controller or connecting
cable.
Time & date
This message appears automatically after a power failure to indicate that the time
and date must be checked and reset if necessary.
Temperature < 50
The temperature measured by the optional sensor S3 has dropped below 50 °C.
Temperature > 70
The temperature measured by the optional sensor S3 has risen above 70 °C. This
means that temperature in the primary circuit is too high and could cause limescale
to form in the heat exchanger.
REPLACING THE FUSE
b
Repairs and maintenance must be entrusted exclu-
sively to an expert service technician. Disconnect
the controller from the electricity supply before com-
mencing any work on it, and make sure it cannot be
accidentally switched back on! Check that it is not
live!
b
Use only the spare fuse supplied, or select a similar
fuse with the following specifications: T2A 250V.
If the controller is connected to the power supply and does
not come into operation, or the display remains blank, the
internal fuse could be defective. In this situation, open up
the controller, remove the fuse and inspect it.
Replace the fuse with a new one of identical characte-
ristics. Ascertain the cause of the fault (e.g. pump) and
replace it.
MAINTENANCE
b
During the course of general maintenance on the system every year, it is important that the functions of the controller
are checked by an expert service technician, and the parameters optimised if necessary.
Maintenance operations:
- Check the time and date
- Assess/check the reliability of analytical data
- Check the error messages
- Check the reliability of current measurement values
- Check the outputs/contacts in manual mode
- If necessary, optimise the setting parameters.
Fuse
Summary of Contents for MODEX ACS 40 E
Page 27: ......
