Pump Blows Circuit Breaker

macT

New member
Jul 7, 2019
2
Republic, Missouri
Need help! All systems perfect for 14 years. Changed filter sand for first time before opening pool. (My pool is located in an area that has very little debris entering the pool.) The old sand was very clean but thought it was time anyway. Sealed the center tube, added the new sand and all went well. (The new sand may have nothing to do with my current problems but thought I would mention.) Priming the pump for the first time was difficult...took much longer than normal. I noticed a dark bunch of gunk fly through the strainer basket and then priming started as normal. Everything was now working as it should, but slowly I began to have problems with the motor getting hot and then tripping the 20A circuit breaker. This continued on and off for a week or so. I decided it may be the gunk I saw in the strainer basket...maybe fouled the pump? I rebuilt the pump with all new parts and seals even though there was no sign of damage or excessive wear. Same problem with blown circuit breaker continued. No change in head pressure...always at 15-16 lbs. (It's a new pressure gauge.) No work had ever been done on the pump or the motor. Last resort, I replaced the motor. The new motor, just like the old motor sounds like a sewing machine and is running smoothly and quietly, but the circuit breaker continues to trip. Both the old motor and the new motor are drawing about 9.5 amps...tested with my clamp around meter. The motor says it should draw 7.6 amps on 220V. Any suggestions would be appreciated. Thanks in advance.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
8,992
Northern NJ
Welcome to TFP.

Replace the CB. Sounds like the CB has tripped many times. Once that happens it can get overly sensitive.
 

Bama Rambler

Mod Squad
TFP Expert
Bronze Supporter
LifeTime Supporter
Jun 22, 2009
23,535
SouthWest Alabama
Do you know how hot the motor is getting, or does it just feel hot? The rule of thumb is, if you can force yourself to leave your hand on it for 8 seconds it's less than 150ºF. I recommend a slightly safer method of using an infrared thermometer. :)

Have you tested the voltage on both legs to neutral/ground, and to each other?
Did you check current draw on both legs?

If all that checks out, then I would change the breaker as Allen said.
 

macT

New member
Jul 7, 2019
2
Republic, Missouri
Thanks all for input. The CB was my next step but I'm overly anxious and not thinking straight...just sold my home. This pool has to be right for new owners or could cause more problems down the way. I have trouble holding my hand on the motor for more than a few seconds. Maybe just a sensitive guy. Now is the time to order that infrared temp. gun I've been wanting.
I measured the current on both of the 220 legs with a good clamp meter and they read the same. I think I did the voltage checks you mentioned but will do them again and reply if things are questionable. Otherwise I'll install new CB and let you know how things go.
Thanks again.