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Deye F29: Parallel CAN-bus Fault

Updated June 2026 · Reviewed for technical accuracy · ~2 min read

F29 only appears when you have more than one inverter wired in parallel. It means they lost their CAN communication link with each other, so they can't coordinate. It's almost always a cable, termination, or address issue, and it often shows briefly during startup before the units sync.

What usually causes F29

  • A loose or wrong parallel comms cable between the inverters.
  • Incorrect addressing or termination (each inverter needs the right address, and the chain needs proper termination resistors set).
  • One inverter off or starting up, so the others can't reach it. F29 can clear once all units are running.

The safe fix, step by step

  1. Wait through startup. F29 frequently clears once all parallel inverters have fully powered up and synced.
  2. Check the parallel comms cables. Make sure the CAN cables between inverters are firmly seated in the correct ports at both ends.
  3. Verify addresses and termination. Confirm each inverter's parallel address and the termination settings follow Deye's parallel-install guide.
  4. Confirm all units are on. Every inverter in the group must be powered.
  5. Restart the group if needed. If F29 persists, your installer should review the parallel configuration.

Quick decision flowchart

F29 appears
↓ all units on, cables + addresses correct?
✅ Clears after startup / reseating cables → comms restored.
❌ Persists → parallel cabling, address, or termination needs review.

Related Deye codes

F41, Parallel system stop F58, Battery comms fault

FAQ

I only have one inverter. Can I get F29?

F29 is specific to parallel (multi-inverter) setups. On a single inverter it shouldn't normally appear; if it does, contact your installer.

F29 shows every morning at startup then goes away.

That's common: the units handshake as they wake up. A brief startup F29 that clears once everything is running is usually nothing to worry about.

Sources

  • Deye Hybrid Inverter User Manual (F29 = "Parallel CANBus fault"; check parallel cabling and communication addresses).
  • Deye dealer technical references for parallel systems.
⚠️ Safety disclaimer. Solar inverters carry lethal DC and AC voltage even when "off". This guide covers the low-voltage comms cabling and settings only. Parallel power wiring and configuration should be handled by a licensed installer.