American Standard Short Cycling Due to Overheat or Oversizing

Furnace short cycles, turning on and off frequently without long run times

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.

Possible Causes

Oversized furnace for duct system, Dirty filter or coil causing high temperature rise, Thermostat located in drafty area, Limit switch opening intermittently on American Standard furnace

How to Fix / Troubleshooting

Safety: Turn off power before inspecting internal components.

Check airflow:
- Replace filter and ensure all registers are open.
- Have coil and blower cleaned if dirty.
Relocate thermostat if needed:
- Avoid placing it near supply registers or exterior doors.
Have a technician:
- Measure temperature rise across the furnace.
- Evaluate furnace sizing and limit operation.

Repair Difficulty

Hard 4/5

Required Part

High Limit Switch

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