If your pump appears 'dead' it might be that the autostopper switch has been operated (maybe a spike in the power .. or more likely a diaphragm has torn). If you have tried a few times to centre the switch and the pump will still not power up it is possible the switch has failed (see below for causes ..'corrosive gasses').
One way to finally test if it is the switch at fault is to temporarily (and carefully - that's full mains voltage in there) connect the outside terminals to bi-pass the switch entirely. If you do this, stand well back and put power to the pump and it tries to start the switch may well be the culprit.
Note : if this item is being replaced it is very possible that the pump is sucking in foul air with corrosive gas. This is a common reason for the auto stopper to fail. We strongly suggest that any pump that needs its auto stopper replacing be checked to ensure the pump is sucking in "clean, fresh air". The pump needs clean fresh air to ensure long life. Foul, moist, air will have a bad effect on the air pump and will invalidate any warranty claim.
Three terminals? .. my switch only has two ..
All replacement switches are three terminal switches. If you are replacing a switch which only has two terminals, simply ignore the centre terminal (this middle one feeds the external service lamp in the event of the switch being operated
Not all EL series pumps have the service light fitted, so this is a quite a common question.
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