MuscleGrid Hybrid Inverter (1.5–10.2 kW) — Common Fault Codes

01Fault Code 01: Fan is locked when inverter is off

MG Hybrid Inverter FAULT CODE 01 — Fan is locked when inverter is off. Applies per the current MG hybrid manuals (1.5–10.2KW). Identify the exact series by invoice date (see the series-identification rule).

02Fault Code 02: Over temperature

MG Hybrid Inverter FAULT CODE 02 — Over temperature. Applies per the current MG hybrid manuals (1.5–10.2KW). Identify the exact series by invoice date (see the series-identification rule).

03Fault Code 03: Battery voltage is too high

MG Hybrid Inverter FAULT CODE 03 — Battery voltage is too high. Applies per the current MG hybrid manuals (1.5–10.2KW). Identify the exact series by invoice date (see the series-identification rule).

04Fault Code 04: Battery voltage is too LOW

MG Hybrid Inverter FAULT CODE 04 — Battery voltage is too LOW. TROUBLESHOOTING (per manual §8):

1. Re-charge the battery;
2. if it persists, replace the battery;
3. check battery connections/cables (loose or undersized cables cause voltage sag under load). For a 24V unit the bank is 24V (2×12V in series) — assess the 24V bank, never ask if it is '12V'. NOTE: this is the meaning per the CURRENT MG hybrid manuals (#712/#713/#714). The older MG6500-48 (#197) manual listed code 4 = 'battery over-current' — for a 6.2kW unit, confirm which manual applies by invoice date/model before advising. Applies per the current MG hybrid manuals (1.5–10.2KW). Identify the exact series by invoice date (see the series-identification rule).

05Fault Code 05: Output short-circuited or over-temperature detected

MG Hybrid Inverter FAULT CODE 05 — Output short-circuited or over-temperature detected. Applies per the current MG hybrid manuals (1.5–10.2KW). Identify the exact series by invoice date (see the series-identification rule).

06Fault Code 06: Output voltage is too high

MG Hybrid Inverter FAULT CODE 06 — Output voltage is too high. Applies per the current MG hybrid manuals (1.5–10.2KW). Identify the exact series by invoice date (see the series-identification rule).

07Fault Code 07: Overload time-out

MG Hybrid Inverter FAULT CODE 07 — Overload time-out. Applies per the current MG hybrid manuals (1.5–10.2KW). Identify the exact series by invoice date (see the series-identification rule).

08Fault Code 08: Bus voltage is too high

MG Hybrid Inverter FAULT CODE 08 — Bus voltage is too high. Applies per the current MG hybrid manuals (1.5–10.2KW). Identify the exact series by invoice date (see the series-identification rule).

09Fault Code 09: Bus soft-start failed (some 1.5–3KW units: over-current/surge)

MG Hybrid Inverter FAULT CODE 09 — Bus soft-start failed (some 1.5–3KW units: over-current/surge). Applies per the current MG hybrid manuals (1.5–10.2KW). Identify the exact series by invoice date (see the series-identification rule).

Inverter series identification by INVOICE DATE

Judge by the INVOICE/purchase DATE. BEFORE March 2026: the unit CANNOT be Focus or Titan (those series launched March 2026) — it is the earlier hybrid range (1.5–5.2KW incl. the 3kW/24V 'True Hybrid'); use manual #714. ON/AFTER March 2026: it may be π Focus/Titan (3.2–6.2KW, #713), the 7.2–10.2KW range (#712), or the earlier range — confirm capacity + system voltage (12V/24V/48V) from the invoice. A 3kW 24V bought before March 2026 = True Hybrid.