Answer
The three-phase Step manual lists these display messages and fixes. Material pressure on the screw too high: reduce the flow rate before restarting, and look for too little binder in the mix, a sand that is not suited to pumping, or an overly long pipeline. Inverter or motor temperature too high: wait for it to cool before restarting. Supply voltage too low: check the power line, and confirm 210 to 230 V with the machine running, with correctly sized cables and no cranes, hoists, saws or mixers on the same line. Other causes the manual lists are a probable external short circuit and a seized pump.
Source
Reviewed by our parts specialists from IMER manuals and parts books. Check the part number on your machine or in its parts book before you order. Not sure? Ask a parts specialist.