E7
Payne Phase Loss / Voltage Imbalance (for 3‑phase commercial Payne units) or Line Voltage Fault

Outdoor Payne unit shows E7; compressor and fan may not start, or only one component runs.

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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

Blown fuse on one phase, Loose line voltage connection at contactor, Utility power imbalance, Failed phase monitor module

How to Fix / Troubleshooting

Danger: This involves high-voltage 240/208/480V circuits. Only qualified personnel should work inside the high-voltage compartment.

  • 1. Visual inspection only (homeowner): With power OFF at the main disconnect, remove the service panel and look for obvious burned wires, melted insulation, or loose lugs at the contactor or terminal block. Do not touch bare conductors.
  • 2. Check external disconnect/fuses: Inspect the outdoor fused disconnect (if present). Replace blown fuses only with the same type and rating. If fuses blow again, stop and call a technician.
  • 3. Technician tasks: A professional should measure line-to-line voltages, verify all three phases are present (for 3‑phase units), check for voltage imbalance, and test/replace the phase monitor or line voltage protection module if faulty.

If you are not trained in electrical work, do not attempt further diagnosis. Call a licensed HVAC technician or electrician.

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Repair Difficulty

Professional Required 5/5

Required Part

Line Voltage Terminal Block / Phase Monitor
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