H7
Pioneer Compressor Position or Phase Error (Inverter Models)

Indoor unit shows H7 and compressor does not start

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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

Incorrect compressor wiring, Faulty compressor position sensor (if equipped), Inverter output phase imbalance, Damaged compressor windings

How to Fix / Troubleshooting

Safety first: High-voltage inverter outputs are extremely dangerous. Do not probe compressor terminals with power applied.

Steps to try (visual):

  • Inspect compressor wiring: With power off, verify that the three compressor leads are firmly connected to the inverter board and match the original positions.
  • Check for burn marks: Look for discoloration or melted insulation on compressor wires.
  • Power reset: Turn power off for 10 minutes, then back on and test.

When to call a pro: H7 requires electrical testing of the compressor and inverter by a qualified technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Inverter Compressor
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