C1
Heil Compressor Start Circuit Fault

Heil outdoor unit LED flashes C1; compressor fails to start reliably

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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

Weak or open start capacitor (if equipped), Failed hard-start kit, Loose compressor wiring, Failing compressor windings

How to Fix / Troubleshooting

Safety first: Turn off power at the disconnect. Capacitors can store dangerous charge; discharge properly before handling.

  • Step 1 – Inspect wiring: Check compressor terminals and wiring for loose connections or burnt insulation. Tighten and repair as needed.
  • Step 2 – Test start components: If your Heil unit has a separate start capacitor or hard-start kit, test it with a capacitance meter and replace if out of spec.
  • Step 3 – Check dual run capacitor: Test the dual run capacitor and replace if weak or failed.
  • Step 4 – Professional compressor test: If start components are good but C1 persists, a technician should perform amp draw and megohm tests on the compressor.
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Repair Difficulty

Hard 4/5

Required Part

Start Capacitor
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