E480
Lennox Compressor Short Cycling Protection

Lennox communicating system shows E480 compressor short-cycling or minimum off-time violation; compressor starts and stops frequently.

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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 system with poor thermostat placement, Low refrigerant charge causing low load, Faulty thermostat or control logic, Rapid power interruptions

How to Fix / Troubleshooting

Safety: Turn off power before accessing control wiring.

  • 1. Check thermostat location: Ensure the Lennox thermostat is not directly in the path of supply air or near heat sources. Relocate if necessary.
  • 2. Verify thermostat settings: Disable any short cycle or minimum off-time overrides. Use manufacturer-recommended cycle rates.
  • 3. Inspect low-voltage wiring: Loose Y call wiring can cause intermittent compressor calls. Tighten R/Y/C connections at thermostat and control board.
  • 4. Monitor power quality: Frequent utility blips can cause rapid cycling. Consider a UPS or power conditioner for the thermostat and controls.

Note: Persistent short cycling can damage the compressor and reduce efficiency; have a technician evaluate system sizing and refrigerant charge.

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Repair Difficulty

Medium 3/5

Required Part

Lennox iComfort Thermostat
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