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BACnet Device Duplicate MAC Address – Symptoms and Fix
A duplicate MAC address occurs when two devices on the same BACnet MS/TP network share the same address number.
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Carrier ComfortLink Alarm 78 – Communication Error Explained
Carrier ComfortLink Alarm 78 generally indicates a communication failure between the main controller and a module or sensor.
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Carrier ComfortLink Alarm 53 – Compressor Protection Fault
Carrier ComfortLink Alarm 53 typically indicates a compressor protection event triggered by abnormal operating conditions.
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Trane RTU Error Code 71 – What It Means and How to Fix It
Trane RTU Error Code 71 commonly indicates a discharge air temperature limit fault or high temperature protection event.
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Trane RTU Error Code 45 – Causes and Troubleshooting
On Trane rooftop units, Error Code 45 may indicate a supply fan proving switch fault or airflow verification failure.
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Honeywell VAV Controller Flashing Red Light – Troubleshooting Guide
On most Honeywell VAV controllers, a flashing red LED indicates a fault condition or communication problem.
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Modbus Register 40001 – What It Actually Means
In Modbus terminology, Register 40001 refers to the first holding register.
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BACnet MS/TP Max Devices Per Segment Explained
For a standard BACnet MS/TP network, the maximum number of devices per segment is 128, based on the BACnet specification.
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Johnson Controls N2 Bus Communication Failure – Troubleshooting Guide
On Johnson Controls systems, an N2 Bus Communication Failure indicates loss of communication between controllers and the supervisory system.
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Carrier ComfortLink Alarm 63 – Compressor Lockout Causes
Carrier ComfortLink Alarm 63 generally indicates a compressor protection lockout due to repeated fault conditions.