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3. Clean off any excessive build-up from the sensor enclosure using a stiff brush or a damp cloth (do not use a dry cloth!).
4. Check that the lock nut moves freely.
5. Apply a small amount of copper slip or grease to the threads to prevent binding.
6. Refit the sensor unit to the ductwork (see section 8.3 above and follow instructions in reverse).
7. Inspect the connecting cable to ensure that it is not damaged or stressed.
8. If necessary, follow the Setup Procedure (see page 15) to reset the dust level.
8.5 TROUBLESHOOTING
NOTE: Always refer to the Safety Information at the start of this chapter.
8.5.1 General
Internal error
The FFD sensor indicates if an internal error has occurred.
Symptom: If this occurs, the STATUS LED will pulse rapidly between GREEN and RED (see also the table on page 20).
The relays and 4–20 mA output will remain in the state present before communication was lost.
Solution: Switch OFF power to the FFD sensor, wait five seconds, then switch ON power to reset the sensor.
If this does not remedy the problem, check the sensor and connecting cables for damage or water ingress.
Sensor not working
On new installations, ensure that the sensor has been connected correctly, both at the FFD sensor and the power
supply.
Solution: On existing installations, carefully check along the full length of the sensor cable for any signs of damage.
On installations where more than one FFD sensor is present, try substituting a known working sensor for the 'faulty'
channel. If the problem is cleared with the working sensor, it is possible that the sensor has a fault and should be
returned to Goyen | Mecair for evaluation and repair.
8.5.2 Alarms
For information on alarm states and on resetting the FFD sensor refer to Alarm Operation on page 20.
INSTALLATION AND OPERATION MANUAL – OWNER'S RECORD FFD MANUAL – FILTER FAILURE DETECTOR
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