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Honeywell HC900 User Manual

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Diagnostics and Troubleshooting - User Interface 
136 
  HC900 Hybrid Controller Installation and User Guide 
Revision 5 
  
9/03 
Table 30 - Scanner Diagnostics 
Diagnostic 
Condition 
Number 
of 
Strobes  
Possible Cause 
Scanner Action User 
Action 
Communication 
failure to main-
CPU 
2 
The scanner is not receiving any 
messages from the main CPU. 
Does no scanning of 
modules. Modules 
remain in their failsafe 
state. 
1. Verify that the jumpers on the 
scanner are setup for the 
correct rack address. 
2. Check that cable is connected 
to expansion rack(C50 CPU 
only). 
3. If a hub is used, check that all 
cables are properly connected 
to the hub, proper crossover 
cables are used, and that hub 
is powered. 
4. Cycle power to the rack. 
5. Cycle power to the hub. 
6. Replace the expansion 
rack’s(C50 CPU only) power 
supply. 
7. Replace the expansion rack. 
8. Replace the expansion rack’s 
scanner module. 
9. Replace the main CPU.
 
Ethernet port data 
link failure 
2 
The communications to the 
main CPU is resulting in a lot of 
DLL errors. 
 Does no scanning of 
modules. Modules 
remain in their failsafe 
state. 
1. Verify that the jumpers on the 
scanner are setup for the 
correct rack address. 
2. If a hub is used, check that all 
cables are properly connected 
to the hub, proper crossover 
cables are used, and that hub 
is powered. 
3. Cycle power to the rack. 
4. Cycle power to the hub. 
5. Replace the expansion 
rack’s(C50 CPU only) power 
supply. 
6. Replace the expansion rack. 
7. Replace the expansion rack’s 
scanner board. 
8. Replace the main CPU.
 
Ethernet port 
hardware failure 
2 
The power-up test of the 
Ethernet controller failed. 
 Does no scanning of 
modules. Modules 
remain in their failsafe 
state. 
Replace scanner module