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Re: The motor keeps turning on & off like it is...
It sounds as if it is overheating. there is a sensor inside all motors that shuts the motor down if it reaches a certain temperature. If your motor shuts down after running for a while then 15 minutes or so just comes back on then that is what is happening. Could be the result of not enough air around the motor to keep it cool, or something inside the motor making it work harder than it should like the bearings going out.
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It sounds like a pump issue, not the filter. When a pump motor runs for a few minutes and then cuts off, that is usually a thermal switch shutting down the motor to keep it from overheating and causing trouble. This typically is caused by a bad winding or some kind of short that is internal to the motor. Usually the fix is to replace the motor, but you may want to have a pool guy out to verify that. Good luck with it!
If the motor can be turned easily by hand then sometimes the starting or run capacitor can be replaced with the same value device and the pump will run. If a new capacitor is installed and it doesn't run then the motor needs to be replaced. If the motor does not turn easily then usually the bearings are bad and the motor needs to be replaced. I hope this helps. The burned smell is either overheated wiring in the motor or a bad capacitor, etc.
CHECK THE VOLTAGE ON THE MOTOR BY CHECKING THE 2 LINES! SEE THAT MOTOR IS SET ON THE RIGHT VOLTAGE, DO A AMP CHECK, MAKE SURE THE START SWITCH IS CENTERED, HAVE THE START CAP TESTED . OR BING IT TO YOUR LOCAL POOL PUMP REPAIR GUY WITH FREE TESTING... THAT WOULD BE ME ''
It sounds like the bearings have gone bad in the jet pump. A shaft seal leak will sometimes let water get into the bearings and the motor will get louder and louder. Running it on high can intensify the noise and heat created by bad bearings. Eventually, the bearings will seize and the motor will try to turn and since it can't, it will get really hot. The motor has built in high limits to keep from burning up completely but it will smell like it's burning. I would replace the pump motor and seal, should take care of the problem. The OH may have been caused by the pump not moving enough water to run the heater and tripped the heaters high temp sensor. I hope this helps.
More than likely the motor is overheating or at least the thermal overload thinks it is. The thermal overload could be bad but if the motor has burnt windings then it probably is pulling too many amps which will cause the overload. Sounds like you need a service call or take the motor to a motor shop.
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.
The motor might be too powerful for the line it's on, (usually a pump should be on a somewhat dedicated line) no Ac's running on same breaker.
An extension cord longer then 6ft is also a suspect in not allowing the pump the draw enough power.
The pump may not be drawing enough water, overheating and tripping the breaker, or the motor might have rust on the inside causing the armature not to spin freely, and shut off. (usually motor will make a high pitch noise) while running)