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Sherri HughesAug 7, 2025
How to troubleshoot a Trane Control Unit when the LED is not lit?
- VvsnyderAug 7, 2025
If the LED on your Trane Control Unit is not lit, take the following steps: * Verify that the 24 Vac power wiring is correctly connected. * Measure the input voltage to ensure it's within the rated range. * Check for continuity to ensure the output wiring isn't shorted. * Disconnect the load and measure the output voltage to verify correct operation. * Consider other loads on the 24 Vac transformer. * Verify the load is correctly sized for the power supply module. * Measure the output voltage to ensure it's within the rated range. * Ensure other modules aren't switching on loads, causing the load current to exceed the recommended rating.