I have a 90's vintage Cal Spa with an ePack controller heater. I replaced the pump. Prior to getting the pump primed I ran the pump and it ran two speeds at what sounded like the right speed for both high and low. After I get the pump primed it slows down to a crawl on high and will not run on low speed. I change the jets from floor to sidewall jets and there is no change. It seems like I have a blockage on the water feeding into the pump but when I loosen the fitting to remove the air it flows freely. It does the same thing whether I have the filter in or out of the filter holder.

The voltage going to the ePack is 118 Vac on each leg (common to red & black wires) and 238 Vac acroass the red and black wires. The output from the ePack to the motor when low speed is selected registers 118 Vac on the red wire and 30 Vac on the black wire. When high speed is selected the black wire goes to 118 Vac with 24 Vac on the red wire. I have the black wire going to the high speed connection on the motor and the red to the low speed connection. As stated above the motor seems to act properly when there is air in the pump but when the pump goes under full load pumping water it slows to a crawl. Di I have the right voltage going to the pump? How can I check for an obstructions on the water input?
Thanks Bill

So, you're sending 110v to a 220v motor?

Confirm the motor is 220v, assuming it is, and assuming the black and red are for high and low speed, and white is "common"

Common to red should be 220v if red is energized, and common to black should be 220v if black is energized. You usually don't get 220v between high and low speed wires, they're usually on the same phase, but you never know...

Just so I am clear, on the power coming into the controller I measure from common to black at 119 Vac and from Common to Red at 119 Vac and from Black to Red I get 239 VAC. That is the way I have understood 220-240Vac power, with each leg coming in with 115 to 120 Vac.

I measure about the same voltage on the output going to the motor. The voltage between the black (high speed) and common should be 220 Vac? and the same for the red (low speed) and common? The motor is clearly labeled for common, high & low speed connections. I did send the controller to ACC and I believe they replace the high speed relay. When the really was bad I got no voltgae to the high speed black wire.

Thanks any more way to check this or do I go to ACC next?
Zoomer

Is the motor 110v or 220v?

"Common" doesn't necessarily mean neutral. It could mean neutral, but it could also mean HOT on a 220v pump. Getting 220v at the pump between high and low is odd, even for a 220v pump.

On a 220v motor, high and low should be getting "hot" (120v), one at a time, but usually on the same phase, and the always hot common (120v on a different phase completes the circuit to get 220v between high and common or low and common. Even if high and low are both energized at the same time, you should not get 220v between high and low, you'd get 0, even though you'd still get 120v testing them one at a time.

If the pump is 115v, that's all moot, it's peculiar they'd use a different phase for high and low, but it's possible.
Before we can continue, we need to know if the pump is 110v or 220v.