Inverter Fault Light Blinking

[BigRig]

New Ventana 4037 owner. Left RV without shore power for 3 weeks after relocating to new concrete pad in back yard. Appears that the house batteries have run down as nothing in the coach works. Plugged in shore power last night (110 using "dog bone"). The inverter monitor in flashing fault (it's a red flashing light - the photo is misleading). Initial research appears to indicate the inverter needs to have a "soft reset." Just wanted a second opinion from someone who may have experienced the same issue. Thanks!
Update: Following the Magnum Inverter owner's manual instructions, I tried to perform as "soft rest." Disconnected AC power then pressed & held the ON/OFF button. Based on the instruction the Status LED should flash. That did not occur.
Also to be clear, when plugged into shore power (only have 110 available using "dog bone" at current location) there is still no electrical power in the coach. Any assistance is appreciated. 

 

[AbdRahim]

You may have to shut off the inverter and charge the batteries with an external charger. After disconnecting the charger, once batteries are well charged, turn the inverter back on. The voltage is too low for the inverter to operate.

Someone with the same system may chime in, but that is what I would try.