Trane Horizon OABD108 Series

Questions and Answers

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Riley SmithAug 19, 2025
What to do if my Trane Horizon OABD108 unit is not running?
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  Russell FrenchAug 20, 2025
  If your Trane Air Conditioner unit isn't running, there are several potential causes: * There may be no power supply to the unit disconnect switch. In this case, check the power supply. * The power disconnect might have tripped; try resetting it. * A lockout alarm mode could be active. Identify and resolve the cause of the lockout alarm. * An Emergency Stop condition might exist, so check if it's activated. * The unit could be in Unoccupied mode; change the unit mode. * The discharge air sensor might have failed or is not installed. Install and connect the discharge air sensor.
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Tara BlairAug 21, 2025
How to troubleshoot OAD Proving Switch in Trane Air Conditioner?
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  Aaron Roman IIAug 22, 2025
  To troubleshoot the OAD Proving Switch on your Trane Air Conditioner, consider the following: * There may be no voltage at the actuator. Check for voltage at the actuator. * The OAD power transformer might have failed. Replace the failed OAD power transformer. * There might be no continuity through the end switch. Check continuity through the end switch.
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Brenda WilsonAug 26, 2025
What to do if there is no compressor in my Trane Air Conditioner?
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  taylor40Aug 26, 2025
  If your Trane Air Conditioner compressor isn't working, here are a few things to check: * The compressor limit switch(es) might be open. Check and close the compressor limit switch(es). * The compressor relay might not be energized or has failed. Energize or replace the compressor relay. * The conditions might not warrant a call for cooling or dehumidification. Verify if conditions require a call for cooling or dehumidification.
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Nicholas HarringtonAug 28, 2025
How to fix wide discharge temp swings in Trane Horizon OABD108?
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  gonzalezginaAug 28, 2025
  If you're experiencing wide discharge temperature swings in your Trane Air Conditioner, it could be due to: * The discharge air sensor being too close to the unit outlet. Adjust the position of the discharge air sensor to be at least 4 ft.-0 in. away from the unit outlet. * Incorrectly set min and max gas heater manifold pressures. Check and adjust the min and max gas heater manifold pressures.
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jacqueline30Aug 30, 2025
What to do if my space is too hot, cold, or humid with Trane Horizon OABD108?
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  Lisa FriedmanAug 30, 2025
  If your space is too hot, cold, or humid when using your Trane Air Conditioner, consider these potential causes: * The setpoints might not be adjusted properly. Adjust the space setpoints. * The space sensors could be incorrectly located or wired. Check and correct the location or wiring of space sensors. * A space sensor might be malfunctioning. Replace the malfunctioning space sensor.
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Courtney RamirezSep 1, 2025
What causes indoor fan failure in Trane Horizon OABD108 Air Conditioner?
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  Wayne GrahamSep 1, 2025
  If the indoor fan fails in your Trane Air Conditioner, here are some possible reasons: * The VFD might not be operating. Ensure VFD is operating. * The outdoor and/or return air dampers might not be operating properly. Check operation of outdoor and return air dampers. * The indoor fan motor could have failed. Replace or repair the indoor fan motor. * The Indoor Fan Failure Switch IFFS (pressure) might have failed. Check and repair the Indoor Fan Failure Switch. * The IFFS tubing could be damaged or not properly connected. Repair or correctly connect the IFFS tubing. * Refer to startup procedure.
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Caitlyn GarciaSep 3, 2025
What causes Discharge Air Temp Source Failure in Trane Air Conditioner?
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  Samantha JohnsSep 3, 2025
  If you're experiencing a discharge air temperature source failure with your Trane Air Conditioner, it could be due to: * BAS communication being down. Restore BAS communication. * A failed sensor or improper sensor installation. Check and replace or properly install the sensor.
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Karen LloydSep 5, 2025
What causes Space Temp Source Failure in Trane Air Conditioner?
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  Austin GravesSep 6, 2025
  If you're experiencing a space temperature source failure with your Trane Air Conditioner, it could be due to: * BAS communication being down. Restore BAS communication. * A failed sensor or improper sensor installation. Check and replace or properly install the sensor.
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Vanessa KingSep 8, 2025
What causes OA Temp Source Failure in Trane Horizon OABD108 Air Conditioner?
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  emmaramirezSep 8, 2025
  If you're experiencing an OA temperature source failure with your Trane Air Conditioner, it could be due to: * BAS communication being down. Restore BAS communication. * A failed sensor or improper sensor installation. Check and replace or properly install the sensor.
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Carl SchmidtSep 10, 2025
What causes OA Humidity Source Failure in Trane Air Conditioner?
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  amanda09Sep 10, 2025
  If you're experiencing an OA humidity source failure with your Trane Air Conditioner, it could be caused by: * BAS communication being down. Restore BAS communication. * A failed sensor or improper sensor installation. Check and replace or properly install the sensor. * Incorrect humidity wiring polarity. Check and ensure humidity wiring polarity is correct.