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112 en | Maintenance
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8.2.4
4 Flashes - Error: Air Pressure Correction Voltage Monitoring
In operation with two detector modules, both LEDs flash. When troubleshooting, the following
steps should be carried out in the specified order.
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2018.04 | 2.0 | F.01U.130.926
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Restore the operating voltage and run the unit for a few minutes.
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If the fan connection is faulty, the malfunction will no longer occur.
Check the fan connection on the motherboard: terminal 1 = red, terminal 2 = black).
The fans are faulty or obstructed
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If the fan connection is correct (troubleshooting step 2), the malfunction will
reoccur.
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Measure the fan voltage (DC) using a multimeter.
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If the fan voltage is outside the limits specified below, the fan may be faulty:
If the fan voltage is set at 6.9 V, the maximum permissible setting is 7.6 V and the
minimum is 6.0 V.
If the fan voltage is set at 9.0 V, the maximum permissible setting is 10.0 V and the
minimum is 7.8 V.
Replace the entire housing, as the fans cannot be removed.
Motherboard faulty
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You will need a second motherboard to make this diagnosis.
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Disconnect the power from the unit.
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Replace the motherboard with a new motherboard of the same type.
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Restore the operating voltage and run the unit for a few minutes.
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If the motherboard is faulty, the malfunction will no longer occur.
Replace the faulty motherboard.
The R3 potentiometer is moved to the setting for the pressure-dependent airflow
calibration.
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Using a multimeter, measure the voltage (DC) at measuring points MP2 (x) and MP3
(-).
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The default measurement value is 1.2 V. However, deviations may occur due to the
calibration of the airflow dependent on air pressure.
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The measurement value must be between 0.5 V and 1.9 V. If the measured voltage
value is outside of this range, the R3 potentiometer setting is faulty.
Note: The malfunction only occurs at voltages below 0.2 V or above 2.3 V.
Using the R3 potentiometer, reset the voltage to a point between the measuring
points MP2 (x) and MP3 (-). 1.2 V for calibration independently of air pressure. In
accordance with the air pressure correction table for air-pressure-dependent
calibration.
Motherboard faulty
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The voltage cannot be set in step 1.
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Disconnect the power from the unit.
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Remove the detector module's connection cables from the motherboard.
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Restore the operating voltage and run the unit for a few minutes.
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If the voltage at measuring points MP2 and MP3 cannot be set with the R3
potentiometer, the motherboard is faulty.
Note: If operating without a detector module, the diagnostics LED flashes 7 times.
Replace the faulty motherboard.
Detector module faulty
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Disconnect the power from the unit.
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Reconnect the connection cable for the first detector module to the motherboard.
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Restore the operating voltage and run the unit for a few minutes.
Operation Guide
Aspirating Smoke Detector
Bosch Sicherheitssysteme GmbH
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