HESP three-phase hybrid (HESP H3/SH3 8-12 kW); code not listed in the single-phase HESP table
SRNE 27 error code
Grid input phase loss (LinePhaselose): one phase of the three-phase AC input is missing.
Likely causes
- Blown fuse or tripped breaker on one phase
- Loose terminal on one phase
- Broken cable or open joint
- Upstream phase failure
Checks to run, in order
- 1Measure all three phase-to-neutral and phase-to-phase voltages at the AC input
- 2Check the three-pole breaker and any fuses
- 3Inspect terminals for looseness or burning
- 4Check upstream distribution for a missing phase
Fixes
- Restore the missing phase and tighten terminations
- Replace the blown fuse or breaker
- Restart after all three phases read normal
When to escalate
If all three phases are healthy at the terminals and the fault remains, the input voltage sensing circuit needs distributor service.
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 27 mean?
Grid input phase loss (LinePhaselose): one phase of the three-phase AC input is missing.
How do I fix SRNE 27?
Restore the missing phase and tighten terminations Replace the blown fuse or breaker Restart after all three phases read normal
When should I escalate SRNE 27?
If all three phases are healthy at the terminals and the fault remains, the input voltage sensing circuit needs distributor service.
Can I reset SRNE 27 myself?
Only after isolating the AC and DC sides and running the checks above. If SRNE 27 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show SRNE 27?
SRNE 27 is documented for HESP three-phase hybrid (HESP H3/SH3 8-12 kW); code not listed in the single-phase HESP table. 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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