Sineng Inverter Alarm Codes | Faisalabad, Lahore

Sineng Inverter Alarm Codes: SN50PT and SN60PT

Short answer

Sineng SN50PT and SN60PT three phase on-grid inverters show an alarm number and name on the panel and in the app. Grid alarms usually come from the supply itself. Insulation, leakage and arc alarms point to the panel wiring or earthing and need an engineer. If an alarm stays after a restart, Sineng's own advice is to contact service.

This table is for the Sineng SN50PT and SN60PT (SN series) three phase on-grid inverters and comes from Sineng's SN series user manual. Other Sineng models may use different numbers, so check your own manual.

Diagram

Sineng alarm groups

Grid

1, 4, 5, 6

Panels and earthing

7, 8, 9, 10, 39, 40, 41

Inverter

21, 23, 24, 25, 33

Sineng SN50PT and SN60PT alarms by where the problem usually is.

Sineng SN50PT and SN60PT alarm table

Code	What it means	Typical cause
1	Grid voltage abnormal	Supply voltage outside the allowed range
4	Grid frequency abnormal	Unstable supply
5	No mains	Load-shedding or AC side disconnected
6	Phase sequence reversed	AC output wiring order
7	GFCI (leakage) fault	Leakage to earth
8	ISO (insulation) fault	DC cable or panel insulation
9	DCI fault	DC on the AC output
10	Neutral-earth voltage abnormal	Neutral or earthing problem
21	Equipment abnormal	Internal
23	High temperature	Hot room or blocked airflow
24	Firmware versions do not match	Internal boards on different versions
25	Communication fault	Communication cable
33	Bus overvoltage	Internal or PV voltage high
39	AFCI (arc) fault	Loose or damaged panel connection
40	PV overvoltage	String voltage too high
41	PV connected in reverse	Panel string polarity

Sineng safe owner checks

Note the alarm number, its name and the time.
During load-shedding, "No mains" is normal. It clears when the supply returns.
Check that nothing is blocking airflow around the inverter.
Check the app for how often the alarm repeats.

When to call an engineer

Alarms 6, 7, 8, 9, 10, 39, 40 or 41: these are wiring, earthing or panel side checks for an engineer only.
Alarms 21, 24 or 33 that return after a restart: usually a manufacturer case.
Grid voltage or frequency alarms that happen every day.

Commercial systems in Punjab

We check commercial on-grid systems in Faisalabad, Lahore and across Punjab, including the AC cable run and earthing.

Send us

The alarm number and name, the inverter model and serial number, and when it happens.