American Standard ACONT401AN21MA

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Installer's Guide8 pages

Questions and Answers

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Jennifer JonesSep 3, 2025
What to do if American Standard ACONT401AN21MA outdoor temperature display shows dashes?
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  pamelabarnettSep 4, 2025
  If your American Standard Temperature Controller's outdoor temperature display shows "--" and the Service indicator is solid, the issue could be: * The outdoor temperature sensor is either open or shorted. * The outdoor sensor field wiring is open or shorted. To resolve this: 1. Replace the outdoor sensor. 2. Check and repair the outdoor sensor field wiring.
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David SanchezSep 18, 2025
What does solid service indicator mean on American Standard Temperature Controller with dashes on temperature display?
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  Kyle BakerSep 18, 2025
  If the service indicator is solid on and "--" is displayed in the temperature display of your American Standard Temperature Controller, the indoor temperature sensor is either open or shorted. Replace the control.
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cliffordwrightSep 16, 2025
Why cannot set heating setpoint above 80 degrees on American Standard ACONT401AN21MA Temperature Controller?
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  Nicholas FosterSep 16, 2025
  If you cannot set the heating setpoint above 80 degrees on your American Standard Temperature Controller, the deadband between heating and cooling is set too high. Decrease the deadband setting using User Setup Step 42.
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Rodney RobinsonSep 14, 2025
Why room temperature overshoots on American Standard ACONT401AN21MA Temperature Controller?
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  tiffany52Sep 14, 2025
  If the room temperature overshoots when using the Energy Savings Key or changing the Heat/Cool settings by more than 2 degrees on your American Standard Temperature Controller, it may be caused by oversized heating or cooling equipment. The control cannot respond quickly enough to prevent overshooting. To resolve this, set the Control Response rate to "Fast" - Step 33.
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Kevin GardnerSep 13, 2025
Why cooling cycle too fast or too slow on American Standard Temperature Controller?
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  hollywatsonSep 13, 2025
  If the cooling cycle is too fast or slow on your American Standard Temperature Controller, it may be influenced by the location of the control or the size of the cooling system. Verify cycle rate adjustment Step 19.
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Ray HernandezSep 12, 2025
Why heating cycle too fast or too slow on American Standard ACONT401AN21MA?
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  ujohnsonSep 12, 2025
  If the heating cycle on your American Standard Temperature Controller is too fast or too slow, resulting in narrow or wide temperature swings, the location of the control or the size of the heating system might be influencing the cycle rate. Verify the cycle rate adjustment in Step 27.
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Joe JamesSep 9, 2025
Why fan does not operate properly in heat or cool mode on American Standard Temperature Controller?
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  Catherine StevensSep 9, 2025
  If the fan on your American Standard Temperature Controller isn't working correctly in heat or cool mode, the possible causes are: * Incorrect wiring. * Heating or cooling equipment inoperative. To solve this: 1. Correct the wiring. 2. Repair the system.
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Brianna WigginsSep 7, 2025
What does flashing service indicator mean on American Standard Temperature Controller?
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  evandeleonSep 7, 2025
  If the service indicator on your American Standard Temperature Controller is flashing on and off, it indicates a Control EEPROM write error. To resolve this, press any key and then check and re-enter your setup choices.
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laurascottSep 5, 2025
Why American Standard Temperature Controller displays cool or heat on but no air?
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  Mark ThorntonSep 6, 2025
  If your American Standard Temperature Controller displays 'Cool ON' or 'Heat ON' but no air is coming from the registers, consider these possibilities: * The heating equipment may turn on the fan only after the furnace has warmed up to a specific temperature. Wait one minute after 'Heat ON' is displayed, then check the registers. * The heating or cooling equipment might not be operating correctly. Check the heating and cooling system.
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kristyharveyAug 20, 2025
Why temperature setting will not change on American Standard ACONT401AN21MA Temperature Controller?
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  jenningsjessicaAug 21, 2025
  If you cannot change the temperature setting on your American Standard Temperature Controller, consider these possibilities: * You may have reached the upper or lower temperature limits. The heating limits are between 40 and 85°F, while the cooling limits are between 65 and 90°F. Check if your desired temperature falls within these ranges. * The keypad might be locked. If "Keypad locked" is displayed on the LCD, unlock it by pressing the Up and Down arrow buttons together until the lock icon disappears.