Doosan (& Daewoo) B20T-5:
Error Code F3 Inverter Fault and F6 R Motor Offline

I have a Doosan B20T-5 Electric with intermittent Trouble codes F3 Inverter Fault and F6 R motor offline. Does one cause the other to pop up or what causes this codes to display? Also, I know that this lift has a D/D Converter. Is this the same as the inverter? A little help please.
  • Posted 16 Jul 2014 12:20
  • Discussion started by Tino
  • North Carolina, United States
Showing items 1 - 3 of 3 results.
The Power Inverters are located in the back panel, and yes for that model there are 3 power inverters, two traction and one pump. I would suggest you check the power inverters with Ohm meter from Batt+ post to then UVW terminals and check resistance. The do the same tests from Batt- connector to all three phases.
  • Posted 15 Aug 2019 22:42
  • Reply by sirthor1881
  • Georgia, United States
we are having the same issue any solution
  • Posted 9 Aug 2019 02:29
  • Reply by doyle_l
  • Iowa, United States
A little update here. I've been doing a little research and this is what I've found about this piece of equipment;

F3- Inverter Fault actually means drive right module desat/overcurrent
F6- R Motor Offline actually means drive right motor current offset

Also found out that this F/L has 3 inverters - one for each drive motor and one for the pump motor. So, I believe that the right inverter may be defective (F3) and causing the F6 code.

Just gotta find out where the inverters are located and I should be good to go.
  • Posted 17 Jul 2014 05:01
  • Reply by Tino
  • North Carolina, United States

Post your Reply

Forkliftaction.com accepts no responsibility for forum content and requires forum participants to adhere to the rules. Click here for more information.

Having trouble using the Discussion Forums? Contact us for help.

Toplift Ferrari TFC36-48
Stoney Creek, Ontario, Canada
Used - Sale
USD1
Taylor T520M
Coraopolis, Pennsylvania, United States
Used - Sale & Hire
Latest job alerts …
Louisville, KY, United States
Louisville, KY, United States
Dubuque, IA, United States
UN Forklift MINI5TON-DIESEL-FORKLIFT
HANGZHOU, Zhejiang, China
New - Sale
Manitou MH25-4
Braeside, Melbourne, Victoria, Australia
Hire

PREMIUM business

Zhejiang UN Forklift Co., Ltd
Manufacturer of IC forklifts, electric forklifts and warehouse equipment.
Fact of the week
On average, people read 10-30% slower from a screen than from paper.
Upcoming industry events …
May 09-11, 2025 - Bangalore, India
October 21-23, 2025 - Panama City, Panama
July 15-17, 2025 - Hong Kong, Hong Kong
Fact of the week
On average, people read 10-30% slower from a screen than from paper.