Growatt Error Codes
Current MOD XH codes separated from legacy TL/MTL search terms, with official remedies only where the exact current manual supports them.
21 of 21 codes
About this fault librarySources · scope
This guide separates current MOD 3–10KTL3-XH evidence from legacy 1000–5000 TL / 2500–5000 MTL vocabulary. Reviewed remedies are attached only to the numbered MOD XH entries recovered in Growatt's official current manual, including warning 205, which the manual identifies as PV boost driver abnormal. Legacy codes and legacy named aliases remain remedy-blank because their service bulletin is available only through a secondary mirror. Australian and global Growatt pages both list the MOD family, but the installed Australian variant and firmware range are not established by the manual metadata. Safety note: owners should record the code and contact their installer. Isolation, measurements, wiring, parameter changes and internal repairs are licensed-worker tasks.
- 21 Growatt fault and alarm codes, documented for the trade.
- Compiled from published documentation and field references; Wattbench is independent and not affiliated with Growatt.
- Codes involving DC/AC isolation, wiring or opening the unit are licensed electrical work. Isolate safely and follow AS/NZS procedure.
Resolution text is manufacturer/service context, not permission for an owner to perform electrical work. Stop at visible observations unless the exact product instructions identify an owner control. Isolation, configuration, testing, opening equipment and wiring are for an appropriately licensed worker and, where required, an SAA-accredited person. Where a card says Product fit is unknown, treat it as brand-level guidance and confirm the exact model, role, regional variant, firmware and current manual before acting.
- 100
Reference-voltage fault
Legacy TL/MTL family: the inverter detected an internal reference-voltage fault.
- 101
CPU communication fault
Legacy TL/MTL family: communication between the inverter's internal processors failed.
- 102
Processor data mismatch
Legacy TL/MTL family: the data reported by the two internal processors is inconsistent.
- 116
EEPROM fault
Legacy TL/MTL family: the inverter reported an internal memory fault.
- 117
Relay-circuit fault
Legacy TL/MTL family: the inverter detected an abnormality in its internal relay circuit.
- 118
Initialisation / model fault
Legacy TL/MTL family: the inverter did not initialise with a valid model configuration.
- 119
GFCI device fault
Legacy TL/MTL family: the inverter detected an internal ground-fault monitoring device fault.
- 120
Current-sensor fault
Legacy TL/MTL family: the inverter detected an internal current-sensor fault.
- 121
CPU communication loss
Legacy TL/MTL family: the main processor did not receive data from the secondary processor.
- 122
Bus-voltage fault
Legacy TL/MTL family: the inverter's internal DC bus voltage is outside its expected range.
- 201 · Residual I High
Residual current high
MOD XH: the inverter detected excessive leakage current. Legacy TL/MTL units can display the named message Residual I High for the same class of protection event.
Product fit · Family-level · MOD 3–10KTL3-XH
Show field stepsHide field steps for 201 · Residual I High: Residual current high
Product fit
MOD 3–10KTL3-XH · Three-phase string inverter
Family-level · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code, time and weather conditions. Do not reset the inverter, touch PV wiring or operate isolators; arrange a licensed inspection if the event persists or returns.
Installer remedy
Apply the MOD 3–10KTL3-XH manual's insulation, residual-current or neutral-to-earth checks under safe isolation. Rectify the cause before returning the system to service; this remedy does not cover the legacy named label.
Remedy sourceMOD XH manual
Manufacturer / escalation handoff
- 202 · PV Voltage High
PV input voltage too high
The PV input voltage exceeded the inverter's permitted limit.
Product fit · Family-level · MOD 3–10KTL3-XH
Show field stepsHide field steps for 202 · PV Voltage High: PV input voltage too high
Product fit
MOD 3–10KTL3-XH · Three-phase string inverter
Family-level · AU/region not confirmed · Firmware not documented
Safe checks now
Leave the inverter and array wiring alone, record the code and contact the installer promptly. Do not reset the unit or operate DC equipment to test whether it clears.
Installer remedy
Measure each string under the approved procedure and compare the temperature-corrected open-circuit voltage with the exact MOD XH input limit. Correct the design before reconnection.
Remedy sourceMOD XH manual
Manufacturer / escalation handoff
- 203 · PV Isolation Low
PV insulation resistance low
The inverter measured low insulation resistance between the PV circuit and earth.
Product fit · Family-level · MOD 3–10KTL3-XH
Show field stepsHide field steps for 203 · PV Isolation Low: PV insulation resistance low
Product fit
MOD 3–10KTL3-XH · Three-phase string inverter
Family-level · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code, time and weather conditions. Do not reset the inverter, touch PV wiring or operate isolators; arrange a licensed inspection if the event persists or returns.
Installer remedy
Apply the MOD 3–10KTL3-XH manual's insulation, residual-current or neutral-to-earth checks under safe isolation. Rectify the cause before returning the system to service; this remedy does not cover the legacy named label.
Remedy sourceMOD XH manual
Manufacturer / escalation handoff
- 205 · PV boost driver abnormal
PV boost driver abnormal
MOD XH warning 205: the inverter detected an abnormal condition in the PV boost driver.
Product fit · Family-level · MOD 3–10KTL3-XH
Show field stepsHide field steps for 205 · PV boost driver abnormal: PV boost driver abnormal
Product fit
MOD 3–10KTL3-XH · Three-phase string inverter
Family-level · AU/region not confirmed · Firmware not documented
Safe checks now
Record warning 205 and the exact inverter model. Do not open the inverter or operate PV equipment to investigate it; contact the installer if the warning remains.
Installer remedy
For a MOD 3–10KTL3-XH displaying warning 205, follow the exact model procedure for one controlled restart. If the PV boost-driver warning remains, stop and escalate to Growatt support rather than inferring a string-side repair.
Remedy sourceMOD XH manual
Manufacturer / escalation handoff
- 300 · AC V Outrange
Grid voltage out of range
MOD XH: the grid voltage is outside the configured operating range. Legacy TL/MTL units use the named AC V Outrange message.
Product fit · Family-level · MOD 3–10KTL3-XH
Show field stepsHide field steps for 300 · AC V Outrange: Grid voltage out of range
Product fit
MOD 3–10KTL3-XH · Three-phase string inverter
Family-level · AU/region not confirmed · Firmware not documented
Safe checks now
Record the event and whether the premises supply appears normal. Do not change the grid profile or operate solar isolators; contact the installer if it repeats.
Installer remedy
Check the grid condition, AC connection and approved settings using the MOD 3–10KTL3-XH manual. Preserve the grid profile and escalate a confirmed supply issue through the network process.
Remedy sourceMOD XH manual
Manufacturer / escalation handoff
- 302 · No AC Connection
No AC connection
The inverter cannot detect an acceptable grid connection.
Product fit · Family-level · MOD 3–10KTL3-XH
Show field stepsHide field steps for 302 · No AC Connection: No AC connection
Product fit
MOD 3–10KTL3-XH · Three-phase string inverter
Family-level · AU/region not confirmed · Firmware not documented
Safe checks now
Record the event and whether the premises supply appears normal. Do not change the grid profile or operate solar isolators; contact the installer if it repeats.
Installer remedy
Check the grid condition, AC connection and approved settings using the MOD 3–10KTL3-XH manual. Preserve the grid profile and escalate a confirmed supply issue through the network process.
Remedy sourceMOD XH manual
Manufacturer / escalation handoff
- 303
Neutral-to-earth abnormal
MOD XH: the inverter detected an abnormal neutral-to-earth condition (NE abnormal). This code is not labelled PE Abnormal in the reviewed MOD XH manual.
Product fit · Family-level · MOD 3–10KTL3-XH
Show field stepsHide field steps for 303: Neutral-to-earth abnormal
Product fit
MOD 3–10KTL3-XH · Three-phase string inverter
Family-level · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code, time and weather conditions. Do not reset the inverter, touch PV wiring or operate isolators; arrange a licensed inspection if the event persists or returns.
Installer remedy
Apply the MOD 3–10KTL3-XH manual's insulation, residual-current or neutral-to-earth checks under safe isolation. Rectify the cause before returning the system to service; this remedy does not cover the legacy named label.
Remedy sourceMOD XH manual
Manufacturer / escalation handoff
- 304 · AC F Outrange
Grid frequency out of range
MOD XH: the grid frequency is outside the configured operating range. Legacy TL/MTL units use the named AC F Outrange message.
Product fit · Family-level · MOD 3–10KTL3-XH
Show field stepsHide field steps for 304 · AC F Outrange: Grid frequency out of range
Product fit
MOD 3–10KTL3-XH · Three-phase string inverter
Family-level · AU/region not confirmed · Firmware not documented
Safe checks now
Record the event and whether the premises supply appears normal. Do not change the grid profile or operate solar isolators; contact the installer if it repeats.
Installer remedy
Check the grid condition, AC connection and approved settings using the MOD 3–10KTL3-XH manual. Preserve the grid profile and escalate a confirmed supply issue through the network process.
Remedy sourceMOD XH manual
Manufacturer / escalation handoff
- 408 · Over Temperature
Over temperature
The inverter temperature exceeded its operating limit.
Product fit · Family-level · MOD 3–10KTL3-XH
Show field stepsHide field steps for 408 · Over Temperature: Over temperature
Product fit
MOD 3–10KTL3-XH · Three-phase string inverter
Family-level · AU/region not confirmed · Firmware not documented
Safe checks now
From a safe position, keep the inverter area clear and note direct sun, abnormal heat or visibly blocked airflow. Do not open the enclosure; contact the installer if it remains.
Installer remedy
Check the MOD 3–10KTL3-XH installation clearances, ventilation and ambient conditions. Escalate if the inverter continues to report over-temperature in normal conditions.
Remedy sourceMOD XH manual
Manufacturer / escalation handoff
- Output High DCI
Output DC injection high
Legacy TL/MTL family: the measured DC component of the AC output exceeded the permitted value.
- Auto Test Failed
Auto-test failed
Legacy TL/MTL family: the automatic grid-protection test used for the Italy configuration did not pass.
Sources
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Frequently asked
- Where do these Growatt fault codes come from?
- Compiled from publicly available Growatt inverter and battery documentation and field references, then rewritten for the trade. Wattbench is independent and not affiliated with Growatt.
- Which of these can I clear on site?
- Some clear on their own once grid or environmental conditions return to normal. Anything involving DC isolation, AC switching, wiring or opening the unit is licensed electrical work. Isolate safely, follow AS/NZS 5033 and AS/NZS 3000 procedure and use appropriate PPE before touching a live system.
- The exact code isn't listed. Why not?
- Firmware and model variants differ, and manufacturers revise their code tables. We document the most common ones; for a variant that isn't here, check the unit's current manual or the manufacturer's service portal.
- How current is this reference?
- This reference was last reviewed on 3 August 2026. We revise entries when the underlying manufacturer documentation changes.
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