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CPO-PC400-W/CPO-PC400-UW HVAC CONTROLLER
TROUBLESHOOTING WITH LEDS
Troubleshooting with LEDs of RS485 Interfaces 1, 2, 3
Table 30. CPO-PC400-W/CPO-PC400-UW Tx and Rx LEDs of RS485 Interfaces 1,2, and 3
Case
LED Behavior
1
Both LEDs of given interface
flashing.
2
Both LEDs of given interface are
OFF.
Troubleshooting with the Ethernet Interface LEDs
Table 31. CPO-PC400-W/CPO-PC400-UW link and activity LEDs of Ethernet interfaces 1 and 2
Case
LED Behavior
1
Yellow LED is ON steadily
2
Yellow LED is OFF
3
Green LED is flashing
4
Green LED is ON
5
Green LED is OFF
EN0B-0085 IE10 R0420
Meaning
Bus is functioning properly.
Bus is not functioning properly.
No communication over given
interface.
Meaning
Ethernet is working with
connectivity below 100Mbps.
• If green LED is ON or flashing,
then Ethernet is working with
connectivity below 10Mbps.
• If green LED is OFF, then
Ethernet is disconnected
Normal operation. The controller
is transmitting/receiving data
to/from the switch via cable.
Ethernet connectivity exists but
no data flow.
Ethernet port link is down.
36
Remedy
No action is necessary.
Check termination. Check the
polarity of bus connections.
Check for EM interference.
Use ComfortMan to check
interface assignment in the
application. Check the wiring.
Remedy
If communication problems
persist, then check green LED.
See Case 3 and Case 4 given
below.
Connect the cable between the
controller and the switch.
If communication problems
persist, the Ethernet parameter
configuration may be defective:
Check IP address, MAC address,
and firmware.
Check the software configuration.
• Check the cable connection
between the controller and the
switch.
• Check the switch.
• Use good a laptop or good
cable to directly connect
the controller and the switch
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