No display / inverter completely dead

Sourced from the official MuscleGrid manuals · updated 2026-08-13

If there is no display and no output:

  1. Check mains supply and the input MCB/fuse.
  2. Check the battery switch is ON and both battery terminals are tight.
  3. Check the main DC fuse. If both mains and battery are present and connections are tight but the unit is still dead, it needs service.

Related guides

⚡
Inverter fault codes→
Look up any error code by series
🔋
Battery fault codes→
JK BMS codes on the battery LCD
🛠
All troubleshooting guides→
Step-by-step fixes for common problems
Still stuck? Our support team fixes these issues every day — most by remote guidance, the rest by free doorstep pickup-repair-return under warranty.
Contact MuscleGrid Support →  ·  Register your warranty