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User interface is the primary unit, without its enable signal the lift won’t run
There is a third micro switch in the user interface that the joy stick operates when pushed in, check the joystick if pushed home home fully and making the switch
if the user interface has failed you can reprogram a wall control to do the same job and mount it in the arm, but it won’t have the isolation function like a original user interface.If you are interested here are the fault codes for the Flow 2A
E01 Software inconsistency error
E02 Service unit circuit error
E03 Read parameter error
E04 Table-data corrupted
E05 Safety MCU not responding
E06 Safety mcu programming failure
E10 Relay circuit error
E11 Brake circuit error
E20 Invalid main drive position
E21 Invalid swivel position
E30 Swivel-zero opto circuit error
E31 Squeeze opto circuit error
E32 OSG optocoupler circuit error
E33 Tornswitch opto circuit error
E40 Drive motorboard H-bridge malfunction
E41 Level motor board H-bridge malfunction
E42 Swivel motor board H-bridge malfunction
E50 Low battery
E51 OSG tripped
E52 Levelling ouside limits
E53 Left-handed squeeze condition
E54 Right-handed squeeze condition
E55 Command error
E56 Pre-levelling error
E60 Drive motor overload
E61 Level motor overload
E62 Swivel motor overload
E70 Swivelling outside limits
E71 RF error
E72 Main drive brake skid error
