6 UNT-SVX041D-EN
Table of Contents
Servicing and Testing Tools . . . . . . . . . . 77
Procedure for Testing Zone Sensor . . . . 77
Procedure for Testing Receiver . . . . . . . . 77
Forcing a Sensor to Transmit . . . . . . . . . 77
Output Power Level . . . . . . . . . . . . . . . . . 77
Failure and Default Modes . . . . . . . . . . . 77
Measuring Output Resistance . . . . . . . . . 78
Cleaning the Sensor . . . . . . . . . . . . . . . . . 78
LED Activity . . . . . . . . . . . . . . . . . . . . . . . . 79
Overriding Outputs . . . . . . . . . . . . . . . . . 80
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . 80
Diagnostics Types . . . . . . . . . . . . . . . . . . 80
Fans with UC400-B Controller . . . . . . . . . 81
Valves with UC400-B Controller . . . . . . . 82
Electric Heat with UC400-B Controller . . 83
ECM Motors . . . . . . . . . . . . . . . . . . . . . . . . . 84
General Information . . . . . . . . . . . . . . . . . 84
Troubleshooting Tips . . . . . . . . . . . . . . . . 84
Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Replacing ECM Components . . . . . . . . . . 86
Circuit Module Replacement . . . . . . . . . . 87
Application Notes . . . . . . . . . . . . . . . . . . . 87
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . 89
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