The jet pump turns on - I can feel the motor and hear it hum. But, instead of the normal jetstream of bubbles shooting into the jacuzzi, there is just light bubbling towards the surface.
I have a Sta-Rite Pump model # MPRA6F-148L
A broken jet internal would allow water to run back up the air lines and contaminate the air lines on all jets that are on the same manifold allowing no air to incorperate into the jets stream resulting in low pressure
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wow if it got that cold there id be winterizing with food grade antifreeze not just drainig it down, you could miss pockets of water here and there and produce a crack in housing someplace , as for trouble shooting a no flow situation try the ole standby method of methodical subsitution it's worked for 100 years , keep removing parts (start at suction line in pool) temporray out of system till flow starts then you know last part sub'd out was it!!!
some tubs have a powered blower (you can hear it) or some tubs have a venturi suction bubbler system, you will have have to pop open service cover to look to see what kind you have, venturi type most of the time are turned off or down to far and don't produce bubbles (twist knobs) powered blowers sometimes have hoses pop off there fittings
First you need to find out if the motor will turn easily. There is usually a cover over the shaft opposite the pump. When you remove this cover the shaft can be turned with a wrench. If it turns easily then the start or run capacitor may be at fault. If it is hard to turn then usually the bearings are bad in which the motor needs to be replaced. You can buy a capacitor and replace the one that is there. If it runs you fixed it, If it doesn't run then the motor needs to be replaced. I hope this helps.
This is an ether or situation. Most systems now are set up with three way valves and if you turn the jets on you will shut the pool returns down. If you turn the pool back on you will shut the spa jets off.
you probably have a check valve (back flow preventer) on the line that supplies water to the spa when the pool is filtering as normal. Your check valve may have some debris in it or the seal inside may have failed allowing the water to drain into the pool when the system is off. You should see a valve on the return line that splits off from the pool return line on your system. There are several different check valves on the market, some have a clear lid that you can inspect without taking it apart. Some of them cannot be taken apart. Your challenge will be to find the check valve, then try to check to see it debris may be holding it partly open or it the rubber seal inside is damaged or missing. I hope this helps.
I would probably say that the pump is clogged up or frozen. The motor humms until the heat sensor clicks it off. Try taking apart the front of pump and see if it turns and you should see the problem. Parts are available at most pool stores. Pumps are usually cheaper online.