Armstrong Air Short Cycling

System short-cycles, turning on and off frequently without reaching set temperature

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Oversized air conditioner, Thermostat located in poor location, Dirty condenser coil causing high pressure trips, Low-pressure switch trips from low charge

How to Fix / Troubleshooting

Safety first: Turn off power before cleaning coils or moving thermostat wiring.

Steps:

  • 1. Check thermostat placement: Ensure the thermostat is not near supply vents, windows, or heat sources. If it is, consider relocating with professional help.
  • 2. Clean outdoor coil: Remove debris and rinse the condenser coil thoroughly.
  • 3. Replace filter: Ensure proper airflow to prevent coil freezing and low-pressure trips.
  • 4. Observe operation: Time the run cycles. If the unit runs only a few minutes before shutting off and restarting, safety switches may be tripping.
  • 5. Professional diagnosis: A technician can check refrigerant charge and safety switch operation. If the unit is significantly oversized, duct or control modifications may be needed.
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Repair Difficulty

Medium 3/5
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