0 . . . 350 Normal working range
350 . . . 450 Slight contamination: Exchange detector soon
450 . . . 510 Heavy contamination: Exchange detector immediately
From 511 O fault: optical sensor is deactivated!
Temperature value [°C] (display of the value currently being measured by the thermal
sensor):
FAH-T 420 -20 °C. . . +65 °C
FAP-OT 420 -20 °C. . . +50 °C
FAP-OT 420 -10 °C to +50 °C
CO value: Display of the value currently being measured by the CO sensor
The CO value specifies the currently-measured CO concentration.
The specified number is calculated as the difference between the current measurement
value and the stand-by value stored in the detector.
The CO concentration displayed lies in the range between 0 (normal operating condition)
and 555 (max. measurement value of the sensor).
Operating hours counter
Display of the duration of operation since the initial start-up of the detector.
Error code C malfunction
Error code Cause of trouble and troubleshooting
10000000 General C malfunction
Possible causes:
– Thermal sensor fault
– Maximum operation duration (5 years) of the C sensor has been
exceeded.
T and C sensors are switched off; the optical sensor is still in operation.
Exchange detector immediately!
11000000 The impedance of the electrochemical cell is too high.
The C sensor is switched off; the rest of the sensors are still in operation.
Exchange detector immediately!
10100000 The permissible operating temperature (-10 °C to +50 °C) has been
exceeded. The C sensor is switched off; the rest of the sensors are still in
operation.
10011110 Malfunction due to read/write error in the EEPROM
Detector is switched off and must be exchanged immediately!
0000xxxx Number of read/write errors in the EEPROM
Contamination
The optical initial set-up value of a new detector is stored in the integrated EEPROM during
the final inspection. The contamination value specifies by how much this analog value has
increased in comparison with the delivery state.
Automatic Fire Detectors LSN
improved
Maintenance and Service | en 39
Bosch Sicherheitssysteme GmbH Operation Guide 12/2012 | 8.1 | F.01U.003.448
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