That errors means the autopilot is trying to move the rudder but it thinks its not moving. If you can manually move the rudder in standby mode with the green or red buttons on the 511, then the problem is typically with the rudder feedback unit. i.e. the rudder is moving but the only way the pilot knows it is if the signal changes from the rudder feedback unit.
If you can't make the pump work with the arrows (or anything else) then the problem lies with the pump. Check 12VDC to the pump and the connection to the processor.
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