AC Operation Problems

How the system behaves over time — how long it runs, how often it cycles, and whether it produces results — is its own diagnostic category.

• RED — Potentially Serious

  Why Is My AC Blowing Smoke?

  Treat this as a safety question first.

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• YELLOW — Inspection Recommended

  Why Is My AC Short Cycling?

  Short cycling means the compressor runs for only a few minutes before shutting off and restarting soon after — typically more than three or four cycles per hour on a hot day.

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• GREEN — Usually Manageable

  Why Is My AC Running Constantly?

  Continuous operation is not automatically a fault.

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• YELLOW — Inspection Recommended

  Why Is My AC Running But Not Cooling?

  When the system runs continuously but the house does not cool, the work being done is not reaching your rooms.

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• GREEN — Usually Manageable

  Why Is My AC Not Keeping Up?

  The signature of "not keeping up" is a house that stays comfortable in the morning and drifts two to five degrees above setpoint during the hottest part of the afternoon, then recovers overnight.

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• RED — Potentially Serious

  Why Is My AC Smoking?

  Smoke coming from the equipment cabinet means a component is overheating right now.

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6 of 50 diagnostic guides in this category.