** If there is no short to ground:
 *** replace the FAN-EXTRACT, AVNCS VENT (18HQ) (Ref. AMM
 TASK 21-26-51-000-001) and (Ref. AMM TASK 21-26-51-400-001).

 *** If the fault continues:
 **** replace the C/B-AIR COND AVNCS VENT/MONG (6HQ).

 . If the circuit breaker stays closed and the fault
 continues:

 * replace the FAN-EXTRACT, AVNCS VENT (18HQ) (Ref. AMM TASK 21-26-51-000-001) and (Ref. AMM TASK 21-26-51-400-001).
 (3) If the circuit breaker (2HQ) is open:
 - close the circuit breaker.
 (a) If the circuit breaker trips:
 - do a check for a short to ground at the wiring between the extract fan (18HQ) pins A/J, A/K, A/L and the extract fan control-contactor (7HQ) pins L1, L2, L3 and the circuit breaker (2HQ) pins A2, B2, C2 (Ref. ASM 21-26/02).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞21-26-00∞∞∞∞∞∞∞∞∞∞Page 235
 201-299, May 01/05 CES 1 If there is a short to ground:

_ - repair the related wiring.
 2 If there is no short to ground:
_ - replace the CNTOR-EXTRACT FAN CTL, AVNCS VENT (7HQ).
 (b) If the fault continues:
 - replace the C/B-AVNCS EXTRACT FAN (2HQ).
 (4) If the fault continues:
 - replace the PRESS SW-EXTRACT FAN, AVNCS VENT (30HQ) (Ref. AMM TASK 21-26-11-000-001) AND (Ref. AMM TASK 21-26-11-400-001).
R **ON A/C 301-399, 401-499,
 B. Possible maintenance messages (one or more of these messages)
 EXTRACT FAN 18HQ
 PRESSURE SWITCH 30HQ
 SKIN AIR OUTLET V 22HQ
 ISOL V 24HQ

 (1) If the test gives the maintenance message SKIN AIR OUTLET V 22HQ, replace the VALVE-SKIN AIR OUTLET, AVNCS VENT (22HQ) (Ref. AMM TASK 21-26-53-000-001) and (Ref. AMM TASK 21-26-53-400-001).

 (2) If the test gives the maintenance message ISOL V 24HQ, replace the VALVE-SKIN EXCHANGER ISOLATION, AVNCS VENT (24HQ) (Ref. AMM TASK 21-26-55-000-001) and (Ref. AMM TASK 21-26-55-400-001).

 (3) If the test gives the maintenance message EXTRACT FAN 18HQ:

 - make sure that the demister filter and the filter cartridge are not clogged (Ref. AMM TASK 21-26-42-200-006) and (Ref. AMM TASK 21-26-42-200-007). If necessary, replace them (Ref. AMM TASK 21-26-43-600-016) and (Ref. AMM TASK 21-26-43-600-017).

 - do a check of the status of the circuit breaker (2HQ).

 (4) If the test also gives the maintenance message PRESSURE SW 30HQ:

 - do the trouble shooting procedure (Ref. TASK 21-26-00-810-816).

 (5) If the circuit breaker (2HQ) is closed:

 - do a check for 115VAC at pins A/J, A/K, A/L of the extract fan (18HQ).
 (a) If there is no 115VAC:
 - do a check for 115VAC at pins T1, T2, T3 of the extract fan control-contactor (7HQ).
 1 If there is no 115VAC:
_
 - do a check for a short to ground at the wiring between the extract fan control-contactor (7HQ), pins L1, L2, L3 and the circuit breaker (2HQ), pins A2, B2, C2 (Ref. ASM 21-26/02).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞21-26-00∞∞∞∞∞∞∞∞∞∞Page 236
 Aug 01/05 CES a If there is a short to ground:

_ - repair the related wiring.
 b If there is no short to ground:
_
 - replace the C/B-AVNCS EXTRACT FAN (2HQ).
 2 If there is 115VAC:
_
 - do a check of the status of the circuit breaker (6HQ).
 a If the circuit breaker (6HQ) is closed:
_
 - do a check for 28VDC at pin A/E of the extract fan (18HQ).
 . If there is no 28VDC:
 * do a check for a short to ground at the wiring between the extract fan (18HQ) pin A/E and the circuit breaker (6HQ) (Ref. ASM 21-26/02).
 ** If there is a short to ground:
 *** repair the related wiring.

 ** If there is no short to ground:
 *** replace the C/B-AIR COND AVNCS VENT/MONG (6HQ).

 . If there is 28VDC, make sure that the warning light of
 the extract fan (18HQ)is off.

 * If the warning light is on, push the RESET pushbutton switch on the extract fan (18HQ).
 NOTE : The fan can operate immediately.
____ The warning light goes off.
 ** If the fault continues, replace the FAN-EXTRACT, AVNCS VENT (18HQ).
 * If the fault continues, do a check for 28VDC at pin AA/9A of the AEVC (10HQ).
 ** If there is 28VDC:
 *** replace the AEVC (10HQ) (Ref. AMM TASK 21-26-34-000-001) and (Ref. AMM TASK 21-26-34-400-001).
　
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