Trane Horizon OAB Series

Questions and Answers

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Mandy HallAug 19, 2025
What to do if my Trane Air Conditioner unit is not running?
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  Nathan MooreAug 19, 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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Melissa HallAug 21, 2025
How to troubleshoot OAD Proving Switch in Trane Horizon OAB?
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  Heather LeeAug 21, 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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Kylie KellyAug 26, 2025
What to do if there is no compressor in my Trane Horizon OAB Air Conditioner?
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  Riley Flowers PhDAug 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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lparkAug 28, 2025
How to fix wide discharge temp swings in Trane Air Conditioner?
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  Kathleen MerrittAug 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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Amber CombsAug 30, 2025
What to do if my space is too hot, cold, or humid with Trane Horizon OAB Air Conditioner?
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  John BrownAug 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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hlucasSep 1, 2025
What causes indoor fan failure in Trane Horizon OAB?
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  marilynvargasSep 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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Peter SheaSep 3, 2025
What causes Discharge Air Temp Source Failure in Trane Horizon OAB?
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  Brenda HannaSep 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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Isaac HallSep 5, 2025
What causes Space Temp Source Failure in Trane Air Conditioner?
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  Michael MartinezSep 5, 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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John MataSep 7, 2025
What causes OA Temp Source Failure in Trane Air Conditioner?
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  Dana FoxSep 7, 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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Mario EvansSep 9, 2025
What causes OA Humidity Source Failure in Trane Horizon OAB?
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  Christine MatthewsSep 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.