onga SMH35, Owner'S Manual

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2. D.R.O.P (Dry Running Over-Temperature Protection)
The Onga SMH series of pumps (excluding the SMH35) are fi tted with the
internationally patented D.R.O.P system which protects the hydraulic parts
from possible damage that can be caused by overheating of the liquid inside
the pump casing.
The overheating can be the result of external causes (outside the pump) or
occurs because the pump stops priming and as water is pumped out the
pump runs dry.
The D.R.O.P system is reset using the switch located on the condenser
box.
3. Restoring Operation
Set the switch to “O”, unplug unit from power outlet. Remove cause of
malfunction.
Wait a few minutes, allowing all the hydraulic parts to cool down.
Set the switch on the “1”, plug the unit into power outlet. The red light
goes off and the pump starts operating. If the red light remains on, turn the
switch to “O”, unplug the unit, wait a few minutes and repeat the start up
procedures.
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