![background image](http://html.mh-extra.com/html/carrier/69nt40-561-300/69nt40-561-300_operation-and-service-manual_2563846079.webp)
4–45
T-365
AL21
CONTROL CIRCUIT FUSE (F1/F2)
Cause:
One of the 18 VAC controller fuses (F1/F2) is open. Refer to Cd08.
Component
System Sensors
Troubleshooting
Check system sensors for short to ground.
Corrective Action
Replace defective sensor(s)
Component
Wiring
Troubleshooting
Check wiring for short to ground.
Corrective Action
Repair as needed.
Component
Controller
Troubleshooting
Controller may have an internal short.
Corrective Action
Replace controller, refer to Controller Service
AL22
EVAPORATOR IP
Cause:
Evaporator motor internal protector (IP) is open.
Component
Evaporator Motor
Troubleshooting
Shut down unit, disconnect power, & check Evaporator Motor IP at
plug connection pins 4 & 6.
Corrective Action
Replace defective evaporator fan motor, refer to EVAPORATOR
FAN MOTOR Service
.
AL23
LOSS OF PHASE B
Cause:
Controller fails to detect current draw.
Component
Incoming Power
Troubleshooting
Check incoming power source.
Corrective Action
Correct power source as required.
AL24
COMPRESSOR IP
Cause:
Compressor internal protector (IP) is open.
Component
Compressor
Troubleshooting
Shut down unit disconnect power, & check resistance of compressor
windings at contactor T1-T2, T2-T3.
Corrective Action
Monitor unit, if alarm remains active or is repetitive replace the com-
pressor at the next available opportunity, refer to COMPRESSOR
Service
Summary of Contents for 69NT40-561-300
Page 2: ......
Page 4: ......
Page 10: ......
Page 14: ......
Page 22: ......
Page 34: ......
Page 108: ......
Page 116: ......
Page 164: ...T 365 8 2 Figure 8 2 Unit Wiring Diagram Based on Drawing 62ï11755 ...
Page 165: ...8 3 T 365 Figure 8 3 Wiring Diagram Based on Drawing 62ï11755 ...
Page 166: ...T 365 8 4 Figure 8 4 Wiring Diagram Based on Drawing 62ï11755 ...
Page 168: ......
Page 172: ......
Page 173: ......