Trane ACONT900AC43UA Service Manual page 219

Alert Codes & Flowcharts
Troubleshooting Flowcharts
Modulating Communicating Gas Furnace
Troubleshooting Flowchart Index - Modulating Communicating Gas Furnace
19) IFC Component Layout
19) LED Flash Codes
20) Getting started
21) 2 Flash Troubleshooting Retry and Recycle Lockout
22) 3 Flash Troubleshooting Pressure Switch Errors
23) 4 Flash Troubleshooting High Limit and Auxiliary Limit
24) 4 Flash Troubleshooting Roll Out Limit
25) 5 Flash Troubleshooting Flame Error
26) 6 Flash Troubleshooting Polarity and Ground Errors
27) 6 Flash Troubleshooting Ignitor and Triac Errors
28) 7 Flash Troubleshooting External Gas Valve Circuit Error
29) 8 Flash Troubleshooting Low Flame Sense Error
30) 9 Flash Troubleshooting Inducer Limit
31) 10 Flash Troubleshooting Blower Comm and System Comm Errors
32) 10 Flash Troubleshooting No System Clock and 24V Comm Mismatch Errors
The following pages include troubleshooting flowcharts in
reference to the modulating 95% communicating furnaces ONLY;
using the FAULT LED and the User Interface as starting points.
The information contained is for reference only and does not
cover all scenarios or problems that may be encountered by a
qualified field technician.
Only qualified technicians should should attempt to install,
troubleshoot, or repair this appliance. Failure to follow all cautions
and/or warnings could result in personal or property damage;
including death.
GF - J 19