06/12/19
Message Overview:
Fault Message:
HUMIDIFIER BOILER OVERHEAT
Fault Code:
2163621ECS
Associated CAS:
| Reporting LRU: | Humidifier Control Unit (HCU) |
| System Description: | 21-71-00 |
| Schematic Diagram: | 21-71-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | 21-71-01 [ Global Express ] [ G5000 ] [ Global XRS ] |
Fault Description:
The Humidifier Control Unit (HCU) senses one of the conditions that follow:
- The humidifier boiler temperature is >130°C for more than 180 seconds
- The humidifier boiler temperature is >140°C for more than 60 seconds
Possible Causes:
- Humidifier Hot Air Shut-off Valve (H_HASOV) (L54)
- Humidifier Water Boiler Temperature Sensor (HWBTS) (MT213)
- Humidifier Control Unit (HCU) (A248)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Quick Links:
| Functional Test of the Humidifier System | AMM 21-71-00-720-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the Humidifier Control Unit | AMM 21-71-17-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Humidifier Control Unit | AMM 21-71-17-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the Boiler Temperature Sensor | AMM 21-71-25-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Boiler Temperature Sensor | AMM 21-71-25-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 [ Global Express ] [ G5000 ] [ Global XRS ] |
Troubleshooting Recommendations:
- Perform a wiring check between HCU and HWBTS.
- If wiring checks are not good, repair the defective associated wiring and do close out.
- If wiring checks are good, continue with next step.
- Perform a wiring check between HCU and H_HASOV.
- If wiring checks are not good, repair the defective associated wiring and do close out.
- If wiring checks are good, continue with next step.
- Using Functional Test of the Humidifier System, Put the HCU into ATP mode. Open and close the Humidifier Hot Air Shut-off Valve (H_HASOV) using the ARINC command code specified in the task. Make sure the valve operate correctly.
- Measure the HWBTS resistance. The resistance should be as per the table below:
Temperature (°C) Resistance (ohms) Temperature (°C) Resistance (ohms) -65 148.40000 160 322.01288 -60 152.42266 170 329.42961 -50 160.44000 180 336.82204 -40 168.42103 190 344.19020 -30 176.36679 200 351.53413 -20 184.27815 210 358.85385 -10 192.15575 220 366.14938 200.00000 230 373.42075 10 207.81294 240 380.66796 20 215.60054 250 387.89103 30 223.36292 260 395.08998 40 231.10014 270 402.26480 50 238.81231 280 409.41550 60 246.49950 290 416.54209 70 320.00000 300 423.64455 80 261.79926 310 430.72289 90 269.41198 320 437.77709 100 277.00000 330 444.80715 110 284.56340 340 451.81305 120 292.10222 350 458.79477 130 299.61654 360 465.75230 140 307.10639 370 472.68561 150 314.57182 380 479.59468 - If fault indication is gone, do close out.
- If fault remains, continue with next step.
- Replace HWBTS.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Replace HCU.
- Do close out.
NOTE: Perform Functional Test of the Humidifier System to confirm the system integrity. This task is the approved Return to Service (RTS) test for the Humidifier System.
If the operator which to operate the humidifier on the ground as it operates in flight, then use the following attached procedure. Please note that the attached procedure is not approved for RTS and can only be used for troubleshooting purpose. Please note that the 3.5 hours delay can not be bypassed in this procedure.
Humidifier Operation with Aircraft W off W (3.5 hours delay activation).