I have gardener Denver's L55 with a low sump pressure fault
To troubleshoot the low sump pressure fault, check first the filter, suction line, and pump. Make sure the filter is clean, the suction line is clear, and the pump isn't seized. If these have all been checked and functioning properly, the next step is to check the differential pressure switch. This allows the pump to switch off when the sump pressure is too low or too high. If the differential pressure switch needs to be adjusted, look for the adjustment nut on the switch and for instructions on adjusting the switch in the owner's manual
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