> ## Documentation Index > Fetch the complete documentation index at: https://learning.kent.co.in/llms.txt > Use this file to discover all available pages before exploring further. # Fault Codes > Every Kent M1 E-code — what the display means, the first response, and which flow continues the job. export const Escalate = () =>

Escalate to Kent New Energy service only — through your registered Kent partner channel or the Kent service desk details on your work order. Do not contact any third-party or component-manufacturer support line for a Kent-branded system: tickets outside the Kent channel are not tracked, not covered, and can void warranty handling.

; export const Applicability = ({labels}) =>
Applies to: {labels.map(l => {l})}
; export const SITE_NAME = "Kent New Energy Knowledge Base"; **Read the code, don't guess it.** Record the exact string from the LCD before touching anything, then take the first response below. Where a row says *Continue in*, that flow — not this table — finishes the job. **For trained/authorized installers only.** Any restart follows the official sequence, and any cover-off work follows [Isolation & Shutdown](/safety/isolation-and-shutdown) — including the 5-minute discharge wait. **The one-restart rule.** For a fault message: power off in the correct order, **wait 5 minutes, restart once**. If the same fault returns, collect the evidence and escalate — repeated power-cycling destroys the diagnostic trail and fixes nothing. ## a. Grid side | Code | Fault name | First response | Continue in | | -------- | ------------------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------ | | **E100** | No AC Connection | Self-clears when supply is restored; check the AC line and AC switch | [Not Starting](/m1/troubleshooting/not-starting) | | **E101** | Grid voltage abnormal | Occasional → self-recovers when the grid normalises. Frequent → measure grid voltage against the permitted range; out of range → the local power operator's problem; in range → the protection point moves only with the operator's consent. No recovery for a long time → check the AC breaker and output cable | [Grid Fault](/m1/troubleshooting/grid-fault) | | **E102** | Grid frequency abnormal | Occasional → self-recovers. Frequent → measure grid frequency against the permitted range; protection point moves only with the operator's consent | [Grid Fault](/m1/troubleshooting/grid-fault) | | **E103** | Grid phase sequence is error | Confirm the three-phase sequence really is reversed; the corrective setting is partner-gated — escalate with the finding | [When to Escalate](/troubleshooting/when-to-escalate) | | **E104** | Output DCI over-range | External-fault cases self-resume when the fault clears; frequent and affecting generation → Kent service case | [When to Escalate](/troubleshooting/when-to-escalate) | | **E105** | Anti-backflow over-limit fault | Switch off the load; check the wiring is connected; verify the load is within specification; intact wiring + in-spec load + persistent fault → Kent service | [Zero Export Failing](/m1/troubleshooting/zero-export-failing) | | **E106** | Meter or CT abnormal | CT direction correct? CT on the correct phase? CT-to-equipment cable intact? | [Comm Fault](/m1/troubleshooting/comm-fault) | | **E107** | Meter or CT reverse connection | Check the CT wiring | [Display Shows Wrong Flow](/m1/troubleshooting/display-wrong-flow) | | **E108** | Grid Other abnormalities | Occasional → self-clears. Frequent → check the grid is within the allowable range; if not, Kent service | [Grid Fault](/m1/troubleshooting/grid-fault) | ## b. Backup side | Code | Fault name | First response | Continue in | | -------- | --------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------ | | **E200** | The off-grid output voltage is too high | Check the output-voltage setting is in the correct range; try increasing the load or adjusting the load distribution | [Backup Not Working](/m1/troubleshooting/backup-not-working) | | **E201** | The off-grid output voltage is too low | Insufficient energy on the PV side and the battery — wait for PV to charge the battery, or for the grid to return in grid-connected mode | [Backup Not Working](/m1/troubleshooting/backup-not-working) | | **E202** | Off-grid output overload | Reduce the loads on the BACK-UP side so load power stays within the maximum BACK-UP output | [Backup Not Working](/m1/troubleshooting/backup-not-working) | ## c. PV | Code | Fault name | First response | Continue in | | -------- | ---------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------- | | **E300** | PV input overvoltage | Check the string series configuration — string Voc must not exceed the inverter's maximum working voltage; the alarm clears itself once the array is configured correctly | [Not Starting](/m1/troubleshooting/not-starting) | | **E301** | PV string reverse connection | Check the string is not reversed | [Not Starting](/m1/troubleshooting/not-starting) | | **E302** | PV overload | Open the AC output switch and DC input switch, wait 5 minutes, close both; persistent → Kent service | [When to Escalate](/troubleshooting/when-to-escalate) | | **E303** | AFCI fault | Five failures in one day auto-recover (or clear manually for immediate recovery); check the CT connection on the AFCI board; frequent arc faults → Kent service | [Not Starting](/m1/troubleshooting/not-starting) | | **E304** | Residual current High | Chance occurrences from external wiring abnormality self-clear; frequent or stuck → check whether PV-string-to-ground impedance is too low | [Nuisance Tripping](/m1/troubleshooting/nuisance-tripping) | | **E305** | PV Isolation Low | Check string-to-PE impedance and rectify any short; check the inverter's protective earth is correctly connected; the confirmed rainy-day low-impedance case follows the code's own drying-out guidance | [Nuisance Tripping](/m1/troubleshooting/nuisance-tripping) | ## d. Battery | Code | Fault name | First response | Continue in | | -------- | ----------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------- | | **E400** | Battery BMS fault | One restart; persists → Kent service arranges on-site investigation | [Comm Fault](/m1/troubleshooting/comm-fault) | | **E401** | Battery BMS running abnormal | One restart; persists → Kent service on-site | [Comm Fault](/m1/troubleshooting/comm-fault) | | **E402** | Battery BMS communication abnormal | One restart; persists → Kent service on-site | [Comm Fault](/m1/troubleshooting/comm-fault) | | **E403** | Battery DCDC fault | One restart; persists → Kent service on-site | [When to Escalate](/troubleshooting/when-to-escalate) | | **E404** | Battery DCDC run abnormal | One restart; persists → Kent service on-site | [When to Escalate](/troubleshooting/when-to-escalate) | | **E405** | Battery output overload | Occasional short overload self-recovers; frequent → reduce the load; in-spec load + persistent fault → Kent service | [Backup Not Working](/m1/troubleshooting/backup-not-working) | | **E406** | Battery overvoltage | No intervention — recovers automatically once battery voltage falls below the recovery threshold after discharge or resting | [Battery Not Charging](/m1/troubleshooting/battery-not-charging) | | **E407** | Battery undervoltage | Recovers automatically once voltage rises above the recovery threshold after charging or resting; long non-recovery with falling voltage is the force-charge (wake) case | [Battery Not Charging](/m1/troubleshooting/battery-not-charging) | | **E408** | Battery SOC is low | Charge the battery | [Battery Not Charging](/m1/troubleshooting/battery-not-charging) | | **E409** | Battery Over-temperature protection | No intervention — wait for the temperature to drop; unrecoverable → on-site confirmation of cell state decides clear-and-restart vs replacement (Kent service) | [Battery Not Charging](/m1/troubleshooting/battery-not-charging) | | **E410** | Battery Low-temperature protection | No intervention — wait for the temperature to rise; resumes automatically | [Battery Not Charging](/m1/troubleshooting/battery-not-charging) | ## e. Gen | Code | Fault name | First response | Continue in | | -------- | -------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------- | | **E500** | Oil machine overload | Stop the genset; check the line is connected; check off-grid output voltage/current/power against the parameter range and reset if out; intact line + in-spec parameters + persistent fault → Kent service | [When to Escalate](/troubleshooting/when-to-escalate) | | **E501** | Oil machine fault | Restart the machine and the genset once; persists → Kent service on-site | [When to Escalate](/troubleshooting/when-to-escalate) | ## f. System | Code | Fault name | First response | Continue in | | -------- | ------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------- | | **E600** | Internal communication fault | One restart; persists → Kent service on-site | [When to Escalate](/troubleshooting/when-to-escalate) | | **E601** | Hybrid Inverter is running abnormally | One restart; persists → Kent service on-site | [When to Escalate](/troubleshooting/when-to-escalate) | | **E602** | Hybrid Inverter fault | One restart; persists → Kent service on-site | [When to Escalate](/troubleshooting/when-to-escalate) | | **E603** | OTA upgrade failure | Firmware is Kent-gated — do not retry OTA in the field \[KNB-VAL-12]; escalate with the failure noted | [When to Escalate](/troubleshooting/when-to-escalate) | | **E604** | Over-temperature protection | Check ventilation at the installation location and ambient temperature against the permitted maximum; improve ventilation/heat dissipation if poor; normal conditions + persistent fault → Kent service | [When to Escalate](/troubleshooting/when-to-escalate) | | **E605** | Fan abnormal | Open the AC output switch and DC input switch, wait 5 minutes, close both; persistent → Kent service | [When to Escalate](/troubleshooting/when-to-escalate) | | **E606** | Parallel machine abnormal | Check the communication line contact — the fault clears itself on normal wiring; persistent alarm → Kent service | [Comm Fault](/m1/troubleshooting/comm-fault) | ## Related pages * [Not Starting](/m1/troubleshooting/not-starting) * [When to Escalate](/troubleshooting/when-to-escalate)