Polaris PB4-60 booster pump not working


New member
May 13, 2015
Livingston, NJ
Hi, realized last week that my Polaris booster pump PB4-60 had stopped working. I hear a humming sound for around 10 seconds and then nothing. After reading the forum, I replaced the capacitor hoping for it to be cause. Unfortunately, the pump is still not running and I am getting the same humming noise for few seconds. I used a screwdriver to turn the shaft and it turns fine. I had bought this motor pump assembly new in 2015 to replace an old one, so I am kind of disappointed to see it going bad in 5 years.

Any idea on what else I can try in short of replacing it with a new unit?



Gold Supporter
May 20, 2020
Katy TX
You want to double check the wire connections in the pump housing. It appears you are getting power to the pump so maybe it could be just a loose connection on one of terminals.
The below is something I copied from an earlier post regarding a pool pump. I cannot attain to is accuracy or if applicable to your booster motor but logically it is a good process to review if you inclined to.
With the meter set to Volts AC measure the pump input between L1 and L2.. If you have about 240 VAC, then the pump should be running, so the pump has to be bad.. If you don't have 240 VAC, that is why the pump is not running.. Keep in mind that you must measure between L1 and L2.. You can't measure between L1 and ground and L2 and ground as this can give you an incorrect reading..

If no voltage is getting to the pump, you need to follow the circuit back to what tells the pump to run.. Most likely a relay called the Pump/Filter relay. Measure the output of the relay, between the two output pins.. L1 and L2.. If you have 240 VAC there, then the wires between the relay and the pump have an issue.. If you have no voltage on the output of the relay, check the two input pins.. If you have voltage on the input pins but not on the output pins, then the relay is not being turned on, or the relay is bad..

If you have no voltage on the relay's input pins, then you need to follow the circuit back to whatever feeds the relay, most likely a circuit breaker.. Do the same thing again.. Measure the circuit breaker's output (between L1 and L2) and see what voltage you have. If you have no voltage out of the circuit breaker, then the breaker is popped, bad, or no power is being applied to the automation panel.


Gold Supporter
TFP Guide
Jul 21, 2013
Northern NJ
If a capacitor does not get it running you can replace the motor. Price out the cost of a new motor plus your hassle timer versus a new pump.