Category Archives: Start capacitor

Water bore start capacitor problem

Often we attend service calls to bore problems where the problem turns out to be the start capacitor.

Start capacitor and start box
Start capacitor and start box
Start capacitor in start box
Start capacitor in start box

In a single phase submersible bore pump the start capacitor is ordinarily in the 240 volt start box. Three phase submersible pumps do not have start capacitors. In some centrifugal pumps the capacitor can be mounted externally on the pump motor housing. It is surprising how often a faulty capacitor is missed as the cause of a bore pump problem particularly when tests are carried out by someone who is not specifically experienced in bore pump service work. Even trained general electricians can misdiagnose this simple problem.

Often a capacitor problem can spotted visually as a failed unit commonly swells or ruptures. A start capacitor should be perfectly cylindrical. Sometimes though a faulty capacitor can only be diagnosed by the serviceman actually testing it when disconnected. As the start box is mains powered it does need a licensed electrician or certified electrical worker to test and replace the start capacitor

Close up burnt bore start capacitor
Close up burnt bore start capacitor

One of our clients from Baldivis sent us these pics of inside his submersible water bore start box.

This is a single phase start box and is a particularly dramatic example of a blown start capacitor.

Burnt bore start capacitor in start box
Burnt bore start capacitor in start box

Our mobile bore service teams carry a variety of different size start capacitors and can quickly diagnose and fix this common bore problem. Call us on Perth 9246 0111.