HESP series hybrid inverters (single-phase 4-12 kW and three-phase 8-12 kW)
SRNE 34 error code
CAN communication fault in parallel operation (CanCommFault).
Likely causes
- Parallel CAN cable loose or broken
- Address conflict between units
- One unit powered down in a running stack
- Firmware mismatch
Checks to run, in order
- 1Inspect the CAN cable and connectors at both ends
- 2Check each unit is powered and has a unique address
- 3Compare firmware versions
- 4Check for a unit that dropped offline
Fixes
- Restore the CAN connection and power to every unit
- Correct addresses and align firmware
- Restart the stack
When to escalate
If the stack still reports CAN failure with sound cabling, involve the distributor to test the 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 SRNE 34 mean?
CAN communication fault in parallel operation (CanCommFault).
How do I fix SRNE 34?
Restore the CAN connection and power to every unit Correct addresses and align firmware Restart the stack
When should I escalate SRNE 34?
If the stack still reports CAN failure with sound cabling, involve the distributor to test the communication board.
Can I reset SRNE 34 myself?
Only after isolating the AC and DC sides and running the checks above. If SRNE 34 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show SRNE 34?
SRNE 34 is documented for HESP series hybrid inverters (single-phase 4-12 kW and three-phase 8-12 kW). Confirm the code on your own unit's display or manual before ordering parts.
More SRNE error codes
- SRNE 01Battery undervoltage alarm: the battery voltage has fallen below the [Batt. Under volt. alarm] value under Battery Setup, and the alarm does not by itself stop the output.
- SRNE 02Battery discharge average current overcurrent, detected by software (BatOverCurrSw); the inverter limits or stops discharge.
- SRNE 03Battery not connected (BatOpen): the inverter cannot see a battery on the DC side and stops the output.
- SRNE 04Battery undervoltage stop-discharge (BatLowEod): the battery has reached the low-voltage cut-off and the inverter has stopped discharging.
- SRNE 05Battery overcurrent detected by hardware protection (BatOverCurrHw); the inverter shuts the output down.
- SRNE 06Charging overvoltage protection (BatOverVolt): battery voltage rose above the over-voltage cut-off and charging was stopped.
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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