Fault codes / Magnum inverter / MEDIUM FLASH, AC in

Magnum inverter: Medium flash, AC in

What it means: Absorb charging, Standby.

What to check

Normal.

Learn the system

• Inverters and transfer switches
• 12V compressor and residential fridges

Practice it on a service call

• Fridge is warm after unplugging

Guided diagnosis

• Inverter

Other Magnum inverter codes

• Magnum inverter: Off Inverter off or faulted
• Magnum inverter: Slow flash (1 per 8 s) Float charging, Standby
• Magnum inverter: Medium flash (1 per s), no AC in Inverting or Searching
• Magnum inverter: Solid on Bulk charging, Standby

Full field guide: Magnum MS inverter charger

Codes come from the maker manuals and public service sheets. Your model's own chart always wins, and LP and 120 volt work belongs to a qualified technician.