SG04LP3/SG05LP1 hybrid families and SG01HP3-EU-DM2
Deye F29 error code
Parallel communication fault between paralleled inverters.
Likely causes
- Parallel CAN/RS485 cable disconnected or crossed
- Wrong communication address or dip-switch setting
- One inverter switched off
- Parallel cable run too close to power cables
Checks to run, in order
- 1Check the parallel cable connections and addresses
- 2Confirm all units are switched on
- 3Check the cable routing
Fixes
- Reseat or replace the parallel cable
- Set unique addresses and correct dip switches
- Restart all units together
When to escalate
If the wiring and addresses are correct and F29 persists, the distributor should check the parallel communication board.
Fix it with the right tools
Check the system around the fault before replacing parts: load, battery bank, PV string and commissioning settings. If you need a second opinion, send the code and your inverter model to our team.
Before you open the inverter
- Isolate both the AC and DC sides, then confirm the display is dead before touching terminals.
- Use insulated tools and one hand where possible. DC arcs do not self-extinguish like AC.
- If you see burnt terminals, swollen cells, leaking electrolyte or a burning smell, stop and escalate instead of resetting the fault.
Questions installers ask
What does Deye F29 mean?
Parallel communication fault between paralleled inverters.
How do I fix Deye F29?
Reseat or replace the parallel cable Set unique addresses and correct dip switches Restart all units together
When should I escalate Deye F29?
If the wiring and addresses are correct and F29 persists, the distributor should check the parallel communication board.
Can I reset Deye F29 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye F29 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye F29?
Deye F29 is documented for SG04LP3/SG05LP1 hybrid families and SG01HP3-EU-DM2. Confirm the code on your own unit's display or manual before ordering parts.
More Deye error codes
- Deye F01PV input polarity is reversed at one or both DC inputs.
- Deye F02PV insulation resistance to earth is below the safety limit.
- Deye F03Ground fault detected on the PV array (GFDI).
- Deye F04GFDI ground-failure alarm: the PV array or inverter is not properly earthed.
- Deye F05Control-board EEPROM read failure.
- Deye F06Control-board EEPROM write failure.
Guidance reviewed 17 October 2026 by the Mishka Energy installer team. Error codes vary by brand, model family and firmware; confirm against the manufacturer manual.
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