My pool pump cuts off after running 5-10 minutes water moving through ok. Just shuts off.no timer involved. It is a new sta rite 2 hp pump

SOURCE: Intermatic timer will not turn pool pump off

If your timer is not turning off the pump its probably wired incorrectly. Check the wires on the back of timer as it should work the same as a regular light switch. They may be reversed.

SOURCE: pool pump starts and stops

The thermal cutout is turning it off, then it turns on after it cools. When it runs does it pump water? The pump may be dragging from a bad bearing or a clogged impeller. Make sure the suction filter is clean. I would suggest hiring a pro pump company to diagnose the problem further.

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SOURCE: sta rite 400na gives error code 05 after about 30 seconds

I am not sure if you have received an answer to the issue, or not, but just in case! An EO5 error code is an open stack flue sensor, or switch, There are two forms of the stack flue sensor, so you will need to know which one you have on the heater.

What this error code means is that the sensor "read" the flue temp to be over 500 degrees. Usually, it is just gone bad and reading the wrong temp.

SOURCE: How do you replace a seal on a Sta-Rite pool pump?

Replacing a shaft seal requires some good mechanical ability.
first, always make sure power is off at the breaker before you work.
You'll have to remove the band holding the wet end to the seal plate. Then remove the diffuser covering the impeller. Remove the cover on the back of the motor. You either need a 7/16 open end wrench or a armature tool to hold the motor shaft while you unthread the impeller (if the impeller has a screw in the middle, you will have to remove it by turning clockwise, left hand threads) counterclockwise. You can then pull the carbon part of the seal off of the impeller, make sure to remove all of it including the metal sleeve. You will then have to remove the seal plate and push the ceramic part out from the back. You can then clean and lube the seal plate and install the new ceramic part of the seal, try not to touch the ceramic with your hands if possible. You can then lightly lube the impeller shaft and slide the carbon part of the seal with the carbon facing toward the ceramic as you thread it on. If the seal plate had a copper heat sink, you can either replace it or use a different size seal. (I believe it's a PS-201) Re-install the seal plate, impeller (and screw if applicable) and diffuser. You should now be ready to mate the seal plate to the wet end. Make sure you fill the pump before you try starting it up, especially with a new (dry) seal.

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SOURCE: shows r 5 code when power is turned on. sta-rite

The R5 is a sequence code in the boot up sequence where your error is occuring. There is nothing in the users manual for these pool heaters that explains this error. Your best bet, unfortunately, is going to be to call Sta Rite. Here is their customer service number: 1-800-831-7133