Question about Polaris Pb4 - 60 Booster Pump

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Polaris booster pump overheats and trips the breaker

My booster pump is a PB4 with a 3/4 h.p. A.O. Smith motor. The polaris runs for about 40 minutes and gets hot and trips the breaker. It started when the polaris got hung up in some string. It jambed the polaris, so I shut the breaker off and untangled the string and stuck it back in the pool. Flipped the breaker back on and noticed that the relief valve at the wall connection was putting out alot more water pressure than it was before. In about 40 minutes it tripped the breaker. What do you think?

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The motor may be repairable. Check with local electric motor repair shops in your area. The motor may need to be replaced though and if so, we sell it at

Posted on Jun 14, 2009


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Posted on Jan 02, 2017


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1 Answer

PB4-60 Overheating

if it shuts down then it most likely is a bad motor. If the voltage is properly wired to the motor then the motor is bad. Sometimes new items turn out to be bad out of the box.
US Parts Center

Jun 25, 2013 | Polaris Pb4 - 60 Booster Pump

1 Answer

I had a new motor installed for the pool pump and it keeps blowing the breaker. The pump is a AO Smith SQ1102. We have a 20 AMP breaker dedicated to the motor. The pool comes on for about 30 minutes a

How long has it been since you have the new motor installed? Did it work after the job was completed? Very possible that the starter circuit has failed, usually when it comes on and runs but overheats and stops, the starter and run circuits are both engaged and that causes it to overheat. If you can read the wiring diagram on the motor and make sure it it correctly wired, you may save it if it is a simple loose wire. Otherwise it sounds like you will have to have whoever changed it come back and do a warranty repair.

Sep 01, 2012 | A.O. Smith Plumbing

1 Answer

I have a Polaris PB4-60 booster pump, less than 3yrs old. I turned the pump and left. When I got back 1hr later, the pump was not running. Breakers had been tripped. Each time we reset the breakers and...

If the device that tripped is a ground fault circuit interupter (GFCI) breaker or receptacle then it is likely caused by 5mA or more of leakage current to ground within the motor. If what tripped is a circuit breaker then there are likely shorted turns within the motor. Usually either of this issues requires a new motor.

If you are not wanting to turn wrenches yourselfthen my best suggestion is to bring it to Leslies Pool Supplies and they oftencan put it right for the price of the parts while you watch (they might not have some parts in stock).

I hope this helps.

Sep 27, 2011 | Polaris Pb4 - 60 Booster Pump

1 Answer

My polaris booster pump does not run when turned on. is there a reset button other than the circut panel?

there is not a reset on the pump itself. It does have a high limit that shuts the motor off if it overheats but will reset on it's own when it cools down. Check to see if it might be tied in with a GFCI or a sub-breaker somewhere.

Nov 10, 2009 | Polaris Pb460 Polaris Booster Pump...

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How to manually reset an AO Smith 2 hp motor?

If you did not press a reset ( and even if you did) the motor is damaged and that is causing the circuit breaker to trip. You need to have the motor inspected to see if the damage is repairable or if you need a new motor. A local electric motor repair shop should be able to take care of that for you. The thermal overload has reset itself if after cooling down the motor is trying to start but trips the breaker.

To be certain it is the motor, disconnect the line leads and be sure they are insulated from ground and one another. Turn the breaker back on. It should stay closed which confirms it is the motor tripping it when connected.

If for some reason the breaker still trips, there is a problem with the electrical circuit feeding the pump.

Jul 26, 2009 | AO Smith A O Smith Motors A O Smith 2hp...

1 Answer

Pump comes on for about a minute...then shuts off..

Has this pump worked at all -pumped water?
When it's running for about a minute, is it pumping water?
Is this a self priming pump or do you need to prime it?

Jun 28, 2009 | Polaris Pb4 - 60 Booster Pump

1 Answer

POLARIS PB-4 3/4 HP BOOSTER PUMP -- body of pump very hot, too hot to hold hand on. 20 amp breaker gets very hot also. Has not tripped the 20 amp breaker yet.

A motor can run that hot and still be within the temperature it can handle. It likely has an internal overload device that will shut it off if it exceeds that temperature. If you see something like "thermally protected" on the motor nameplate, you are ok. If it is getting noisy as it runs it may need servicing.

Jun 08, 2009 | Polaris Pb4 - 60 Booster Pump

1 Answer

Overheats and trips off

internal thermal over loads in motor are working properly! how old is the motor? double check all vavles on the intake and discharge line to make sure that they are open? sounds like the pump is pushing against what is known as dead head pressure. obstruction in discharge line! if valves are ok you can take the jet covers off (the piece that helps direct flow of water) which will relieve some of the pressure should allow it to run without tripping tgermal overloads. if none of this works replace motor!!

May 28, 2009 | Smith AO Pool Pump Motor

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