Answer
The manual gives one cause for an outlet that will not open: a blocked outlet guard. Unplug the mixer, undo the guard bolts, take the guard off and clean it out; refit the guard before you run the machine again. At the end of a shift, wash the tank thoroughly, but keep the pressure-washer jet away from the plug, socket and power switch. Never hammer the tank or hit it with a shovel. Dents make the mix less even and make the tank harder to clean. Before a long break, empty the tank and clean it so mortar cannot set inside.
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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.