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Chapter 11
Troubleshooting
This troubleshooting procedure is meant to help resolve most common
problems associated with a Tracer Summit BCU. Troubleshooting can
generally be divided into the following categories:
• BCU does not respond
• BCU locks up
• BCU does not communicate via modem
• BCU does not communicate with UCMs
BCU does not respond
This is a general problem that can be caused by a broad range of factors.
Use the following checklist for troubleshooting for this problem:
1. Verify that the BCU has the correct ac supply voltage.
2. Check for the proper device address on the BCU logic board.
3. Check that the BCU power is connected to the termination board.
4. Verify that the BCU is not set up for BACnet/IP communication is it
is on a dedicated Ethernet site.
5. Verify that the BCU LEDs sequence properly on power up. (See Chap-
ter 10, “BCU operation and communication status.”)
6. Verify that the Ethernet LEDs show normal activity, indicated by the
green LED remaining steadily lit and the yellow LED flashing.
7. Check the Ethernet cable connection. Check that the correct cable
type is being used.
8. Perform a Clear Code, Database, RAM, and Reset using the BCU DIP
switches. Then repeat steps 5 and 6. See Chapter 8 for details.
9. If the above steps do not resolve the problem, contact a qualified
Trane service technician for service.
BCU locks up
The following list describes situations that could cause the BCU to lock
up:
• A building power disturbance, such as that caused by electrical
storms, may affect BCU power in such a way that the BCU locks up.
Cycling power again on the BCU will normally clear this up. Repeat
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