I just purchased a brand new E5 circulation pump to replace my defective Silentflo 5000. Installed everything properly and it is tripping the 20amp circuit within 1 second. If I disconnect the circ pump in the control panel, it does not trip the breaker and everything else works properly - jet pumps, control panel, heater, etc. I wire and rewired the pump to insure everythign was clean (no fray strands, etc).

Here is how I have the E5 wired:

Black wire going to 'L'
White wire going to 'N'
Green wire going to Ground

By the way, the installation instructions that came with the pump are not correct. I validated the above with my local hot springs dealer who also said the instructions are incorrect. I installed in a drained spa, so no water or moisture anywhere near the cir pump.

Any help is appreciated. I am beginning to think this new pump is defective.

It sounds like a bad circ pump from the factory. I would unhook the wires at the circ pump, if it still trips and doesn't when disconnected at circuit board the it could be a bad circ pump cord.

Pete
http://www.makesmeshutter.com

Well after performing a bunch of tests, I am confident the pump is working fine. Took it out and hooked it up to a 110 outlet running water through the pump and worked great. I also used the wiring harness for the test, so that's not bad either.

Checked the ohms on each line.

When not in tub--
0.L on Line-Ground
0.L on Neutral-Ground
~5ohms on Line-Neutral

As I said pump runs fine when out of tub.

When in tub and hooked to the control panel-- still flips 20amp breaker and ohms out as follows:

~5ohms on Line-Ground
~0.2 on Neutral-Ground
~5ohms on Line-Neutral

Wondering why when in the tub hooked to the control panel I get a reading on the Line-Ground. Maybe my control board is bad for that connection. Any good way to check? Or maybe 20amp GFCI as previously suggested, but that still doesn't explain why Jet1 and Jet2 which work off the 20amp work fine when circ pump is disconnected.

It maybe time to call in the service.

I'm still leaning toward the circ pump being bad. It is tripping the GFI which tells me it has a current leakage to ground. It runs fine on the 110v line because it is not a GFI line.
I would go back to where you bought the circ pump and tell them the symptom.They should give you a new one (1 year warranty on part). You could then hook it up without plumbing it and turn it on for a couple seconds to see if trips breaker.

Pete
http://www.makesmeshutter.com

Is there any way to test with a probe or meter to see if the ground is leaking? I measured the Ohms on pump before and after hookup. Reads 0.L Black-Ground when disconnected from Control Board. When connected to the Control Board it reads about 5ohms. I also just read the control board with nothing connected, confirmed 5ohms on the Black-Ground.

One other test I thought about was to plug the circ pump into the Jet 2 connector since I know that works fine. What do you think?

I bought the pump online so would prefer to know for sure before going through the hassle of exchanging.

You'll need a meter to test AC Milli amps. You unhook the ground wire and put the meter between the ground wire and the terminal it came off. You shouldn't get much of a reading.

We need to know what spa you have and the year? (A Serial Number is the best). Some use the 20 amp for the heater.

Does the 30 amp turn on the power to the spa?

Pete
http://www.makesmeshutter.com
These are only suggestions - use at your own risk.

It is a 1998, Model G - Serial G381210 Grandee Spa.

The 30amp runs the heater and the 20amp runs the display and pumps.

Ok, I didn't have the meter you mentioned so tried a series of tests suggested by a coworker.

I unhooked the ground and bonding wire from the circ pump to the control panel. Only line and neutral connected. With the heater completely disconnected it runs fine. All pumps work - jet1, jet2 and circ. Display works fine as well.

Now if I connect the heater back up to the control panel (black, white and green), it flips the breaker.

So it's pretty clear there is a relationship between my heater and the circ pump.

They are close in proximity in terms of water source. Everything is very dry so no chance of excess water in the compartment. Any further suggestions? Thanks for your help.

Oh, one more thing I tried. I disconnected just the heater ground (green). Left the black and white in. Everything is working - heater, jet1, jet2, circ. Of course, not grounded so unsafe, but wondering now if my problem is the heater, not the circ pump.

This is a good one. Sounds like there is current loss to ground somewhere. I would check the ground from the spa to the sub-panel.

It is the 20 amp that is tripping correct?
On that spa the 30 runs the heater.

DAN - any ideas?

Pete
use this advice at your own risk

http://www.makesmeshutter.com