W DOC AIRBUS | TSM A320F

Cabin Recirculation Fault

TASK 21-21-00-810-802-A
Cabin Recirculation Fault

1. Possible Causes
  • mixer unit ducts
  • RECIRC FILTER CARTRIDGE 1 [4012HM]
  • RECIRC FILTER CARTRIDGE 2 [4013HM]
  • P/BSW-VENTILATION/CAB FANS [4HG]
  • RELAY-FAN FAULT SUPPRESS [16HG]
  • RELAY-L FAN POWER [5HG]
  • RELAY-R FAN POWER [6HG]
  • RELAY-L FAN CONTROL [7HG]
  • RELAY-R FAN CONTROL [8HG]
  • RELAY-L FAN FAULT [10HG]
  • RELAY-R FAN FAULT [9HG]
  • RECIRC FAN 1 [15HG]
  • RECIRC FAN 2 [14HG]
  • wiring
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 21-21-00-710-001
Operational Test of the Cabin Recirculation Fans
ASM 212101
AMM 21-21-41-000-001
Removal of the Recirculation Filter
AMM 21-21-41-400-001
Installation of the Recirculation Filter
AMM 21-21-43-000-001
Removal of the Mixer Unit
AMM 21-21-43-400-002
Installation of the Mixer Unit
AMM 21-21-51-000-001
Removal of the Cabin Recirculation Fans
AMM 21-21-51-400-001
Installation of the Cabin Recirculation Fans
ASM 216301
AMM 25-55-12-000-001
Removal of the Aft Cargo-Compartment Partition FR65
3. Fault Confirmation
Subtask 21-21-00-710-054-A
A. Do the operational test of the cabin recirculation fans 14HG and 15HG AMM 21-21-00-710-001.
4. Fault Isolation
Subtask 21-21-00-810-053-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message RECIRC FAN 1 AND 2 OR SPLY:
  • remove the access panels 131PW, 131NW and 132PW AMM 25-55-12-000-001,
  • visually inspect the mixer unit ducts for damage (pay special attention to the lateral seams of the ducts).
   (1) If you find damage then you must replace the mixer unit AMM 21-21-43-000-001 and AMM 21-21-43-400-002.
   (2) If there is no damage,
   (3) If the recirculation fans (14HG, 15HG) operate correctly:
  • do a check of the recirculation filters (4012HM, 4013HM) for contamination.
     (a) If the filters are clogged:
     (b) If the filters are not clogged:
   (4) If the recirculation fans (14HG, 15HG) do not operate:
  • do a check of the P/BSW-VENTILATION/CAB FANS [4HG] and replace it if necessary ASM 212101.
     (a) If the fault continues:
  • do a check of the RELAY-FAN FAULT SUPPRESS [16HG] and replace it if necessary ASM 212101.
     (b) If the fault continues:
  • do a check of the RELAY-L FAN POWER [5HG] and replace it if necessary ASM 212101,
  • do a check of the RELAY-R FAN POWER [6HG] and replace it if necessary ASM 212101.
     (c) If the fault continues:
  • do a check of the RELAY-L FAN CONTROL [7HG] and replace it if necessary ASM 212101,
  • do a check of the RELAY-R FAN CONTROL [8HG] and replace it if necessary ASM 212101.
     (d) If the fault continues:
  • do a check of the RELAY-L FAN FAULT [10HG] and replace it if necessary ASM 212101.
  • do a check of the RELAY-R FAN FAULT [9HG] and replace it if necessary ASM 212101.
     (e) If the fault continues:
     (f) If the fault continues:
  • do a check and repair the wiring ASM 212101 and ASM 216301 between the:
    FAN (15HG) connector A/A and CB (1HG),
    FAN (15HG) connector A/B and CB (1HG),
    FAN (15HG) connector A/C and CB (1HG),
    FAN (15HG) connector A/E and CB (2HG),
    FAN (15HG) connector A/F and GND,
    FAN (15HG) connector A/D and GND,
    FAN (14HG) connector A/A and CB (3HG),
    FAN (14HG) connector A/B and CB (3HG),
    FAN (14HG) connector A/C and CB (3HG),
    FAN (14HG) connector A/E and CB (11HG),
    FAN (14HG) connector A/F and GND,
    FAN (14HG) connector A/D and GND,
    RELAY (7HG) connector A/X1 and RELAY (5HG) connector A/X1,
    RELAY (7HG) connector A/X2 and GND,
    RELAY (10HG) connector A/Z and RELAY (5HG) connector A/C1,
    RELAY (10HG) connector A/X and GND,
    RELAY (10HG) connector A/1 and ZC (8HK) connector AB/1E,
    RELAY (10HG) connector A/A and GND,
    RELAY (16HG) connector A/X and SW (4HG) connector A/C2,
    RELAY (16HG) connector A/Z and GND,
    RELAY (8HG) connector A/X1 and RELAY (6HG) connector A/X1,
    RELAY (8HG) connector A/X2 and GND,
    RELAY (9HG) connector A/X and RELAY (6HG) connector A/C1,
    RELAY (9HG) connector A/Z and GND,
    RELAY (9HG) connector A/1 and ZC (8HK) connector AB/1D,
    RELAY (9HG) connector A/A and GND.
Subtask 21-21-00-810-053-B ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message RECIRC FAN 1(15HG) AND 2(14HG) OR SPLY:
  • remove the access panels 131PW, 131NW and 132PW AMM 25-55-12-000-001,
  • visually inspect the mixer unit ducts for damage (pay special attention to the lateral seams of the ducts).
   (1) If you find damage then you must replace the mixer unit AMM 21-21-43-000-001 and AMM 21-21-43-400-002.
   (2) If there is no damage,
   (3) If the recirculation fans (14HG, 15HG) operate correctly:
  • do a check of the recirculation filters (4012HM, 4013HM) for contamination.
     (a) If the filters are clogged:
     (b) If the filters are not clogged:
   (4) If the recirculation fans (14HG, 15HG) do not operate:
  • do a check of the P/BSW-VENTILATION/CAB FANS [4HG] and replace it if necessary ASM 212101.
     (a) If the fault continues:
  • do a check of the RELAY-FAN FAULT SUPPRESS [16HG] and replace it if necessary ASM 212101.
     (b) If the fault continues:
  • do a check of the RELAY-L FAN POWER [5HG] and replace it if necessary ASM 212101,
  • do a check of the RELAY-R FAN POWER [6HG] and replace it if necessary ASM 212101.
     (c) If the fault continues:
  • do a check of the RELAY-L FAN CONTROL [7HG] and replace it if necessary ASM 212101,
  • do a check of the RELAY-R FAN CONTROL [8HG] and replace it if necessary ASM 212101.
     (d) If the fault continues:
  • do a check of the RELAY-L FAN FAULT [10HG] and replace it if necessary ASM 212101.
  • do a check of the RELAY-R FAN FAULT [9HG] and replace it if necessary ASM 212101.
     (e) If the fault continues:
     (f) If the fault continues:
  • do a check and repair the wiring ASM 212101 and ASM 216301 from:
  • the FAN (15HG) to the CB (1HG),
  • the FAN (15HG) to the CB (2HG),
  • the FAN (15HG) to ground,
  • the FAN (14HG) to the CB (3HG),
  • the FAN (14HG) to the CB (11HG),
  • the FAN (14HG) to ground,
  • the RELAY (7HG) to the RELAY (5HG),
  • the RELAY (7HG) to ground,
  • the RELAY (10HG) to the RELAY (5HG),
  • the RELAY (10HG) to ground,
  • the RELAY (10HG) to the ACSC1 (47HH),
  • the RELAY (16HG) to the SW (4HG),
  • the RELAY (16HG) to ground,
  • the RELAY (8HG) to the RELAY (6HG),
  • the RELAY (8HG) to ground,
  • the RELAY (9HG) to the RELAY (6HG),
  • the RELAY (9HG) to the ACSC2 (57HH) and,
  • the RELAY (9HG) to ground.
Subtask 21-21-00-710-055-A
B. Do the test as given in the Para. 3.A.
[Rev.8 from Aug 2018] 2026.04.04 04:24:35 UTC
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