Deye Inverter Error Codes — Complete Troubleshooting Guide
When your Deye inverter displays an error code, quick identification and response can prevent damage and minimise downtime. This guide covers the most common error codes across Deye SUN-series hybrid inverters and their solutions.
Critical Errors (Immediate Action Required)
| Code | Description | Cause | Solution |
|---|---|---|---|
| F01 | DC Bus Over Voltage | String voltage exceeds maximum | Check panel string voltage. Reduce panels per string if Voc exceeds 850V. |
| F02 | DC Bus Under Voltage | Insufficient PV voltage | Verify panel connections. Check for broken MC4 connectors or damaged cables. |
| F04 | Ground Fault | Current leakage to ground | Inspect all DC wiring for damaged insulation. Check panels for moisture ingress. |
| F07 | Over Temperature | Internal temperature too high | Improve ventilation. Clean dust from heatsink. Check fan operation. Common in UAE summer. |
| F08 | Grid Over Voltage | Grid voltage exceeds 264V | Contact DEWA. May indicate local grid voltage regulation issues. |
| F09 | Grid Under Voltage | Grid voltage below 184V | Contact DEWA. Check AC wiring connections. |
Warning Codes (Monitor and Address)
| Code | Description | Solution |
|---|---|---|
| W01 | Fan Failure | Clean or replace cooling fan. Critical in UAE heat. |
| W03 | Battery Communication Lost | Check CAN cable between battery and inverter. Reseat connectors. |
| W05 | Low Battery Voltage | Battery SOC critically low. Check battery health and connections. |
| W07 | PV Insulation Low | Moisture or damage on solar panel wiring. Inspect MC4 connections. |
| W10 | Wi-Fi Module Offline | Reset Wi-Fi module. Check router connectivity (2.4 GHz only). |
UAE-Specific Issues
F07 Over Temperature (Most Common in UAE)
This is the most frequent error in UAE summer installations. The inverter shuts down to protect internal components when temperature exceeds the safety threshold.
- Immediate fix: Wait 30-60 minutes for the inverter to cool, then restart
- Permanent fix: Improve ventilation around the inverter. Add shade structure. Ensure minimum clearances. Consider relocating to a cooler wall.
- Prevention: Install on east or north-facing walls. Maintain 50 cm clearance above and below. Clean dust from heatsink and fan monthly during summer.
W03 Battery Communication Lost
Common after sandstorms when fine dust enters the CAN connector. Disconnect and clean the CAN cable connector with compressed air. Apply dielectric grease to prevent future corrosion.
When to Contact Support
Contact your Deye distributor or installer if: the error persists after trying the solutions above, the inverter shows a code not listed here, you smell burning or see physical damage, or the inverter will not restart after cooling.
Frequently Asked Questions
What does F07 error mean on a Deye inverter?
F07 means Over Temperature — the inverter has exceeded its safe operating temperature and shut down to protect itself. This is the most common error in UAE summer. Wait 30-60 minutes to cool, then restart. Improve ventilation and add shade to prevent recurrence.
How do I reset a Deye inverter after an error?
Most errors clear automatically once the cause is resolved. Turn off the AC breaker, wait 60 seconds, then turn it back on. For persistent errors, also turn off the DC isolator and wait 5 minutes before restarting both. If the error persists, contact your installer.
What does W03 battery communication lost mean?
W03 indicates the inverter cannot communicate with the battery's BMS via the CAN cable. Check that the CAN communication cable is securely connected at both ends. Clean connectors if dusty. This is common after sandstorms in the UAE.
