Message Name:

R WNDW TEMP CTRL FAILED

Message Code:

B3-007865

Associated CAS:

R WINDOW HEAT FAIL
(Caution)

Right Window Temperature Controller has failed.

• Right Side Window TemperatureController (RSWTC) (A160)
• Window Heater Sensor(s)
• Window
• Remote Data Concentrator (RDC) (A13)
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW300-30-0018 - Windshield and Side Window Heater: Terminal Wire Connection Loose

Forum Articles/Infoservice/Newsletter: None

Alert Service Bulletin:

• A100-30-03 - Special Check - Windshield and Side Window Anti-Ice - Torquing of Electrical Connections at Terminal Blocks TB3 and TB4; Ground Studs GS2269, GS2270, GS2273, and GS2274; Windshield Terminals G, H, L1, and L2; and Side Window Terminals P and G

NOTES:

• The L and R Window Temperature Control circuits and parts (including relays) can be used for troubleshooting if needed (interchange).
• The Windshield Temperature Controllers and Side Window Temperature Controllers are different part numbers.
• In case of transparency removal, fill the Transparency return form, send a copy to the CRC and attach a copy to the returned unit.

1. Confirm status of Circuit Breaker (CB) CB4-D9.

   1. If the CB is open, investigate the reason before resetting.
   2. If there are Secondary Power Center related faults in the MDC, look for commonalities with the associated power bus (R MAIN BUS) and investigate.
   3. If CB is IN, continue with next step.

2. Make sure WSHLD/WINDOW R PBA is ON.
3. Measure 28 VDC at Right Side window Temperature Controller (RSWTC) A160P1 pin U.

   1. If there is 28 VDC, go to step 7.
   2. If there is no voltage, continue with next step.

4. Interchange WSHLD/WINDOW PBAs.

   1. If system checks are good, do close out.
   2. If fault remains, continue with next step.

5. Perform wiring checks between the Anti-Ice panel (PL19), the Secondary Power Center (A38) and the left Side Window Temperature Controller (A160).

   1. If wiring defects are found, repair defective wiring and do close out.
   2. If no defects are found, continue with next step.

6. Replace the Anti-Ice panel (PL19).

   1. If system checks are good, do close out.
   2. If fault remains, continue with next step.

7. Interchange SWTCs.

   1. If fault follows, replace faulty unit.
   2. If fault remains, continue with next step.

8. Check the resistance value of the 3 temp sensors in the window.

   1. If resistance is within tolerance, continue with next step.
   2. If a sensor reads outside the nominal values without being OPEN/SHORT, contact the Bombardier Customer Response Center (CRC) for a disposition. The OPEN/SHORT sensor will be rejected by the controller and the system will continue to be serviceable.

   NOTE: The key to this step is all 3 should be relatively the same. The outside air temp would be a factor. The tech could compare resistance readings to that of the known good window on the other side of the plane.
   NOTE: The L and R Window Temperature Control circuits and parts (including relays) can be used for troubleshooting if needed (interchange).

   Condition	S1 - SG (Resistance)	S2 - SG (Resistance)	S3 - SG (Resistance)
   at 65°F	339 ±3 Ω (nominal)	339 ±3 Ω (nominal)	339 ±3 Ω (nominal)
   at 80°F	350 ±4 Ω	350 ±4 Ω	350 ±4 Ω
   OPEN Circuit	> 500 Ω	> 500 Ω	> 500 Ω
   SHORT Circuit	< 212 Ω	< 212 Ω	< 212 Ω
   An Overheat condition (> 180°F) could cause a L (R) WINDOW HEAT FAIL caution message (i.e. Long exposure to the sun): • R > 430 Ω (180°F) for any valid sensor (Not open or Not short)

9. Perform wiring checks between RSWTC and RDC.

   1. If wiring defects are found, repair defective wiring and do close out.
   2. If no defects are found, continue with next step.

10. Replace the Remote Data Concentrator (RDC).
11. Do close out.