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Jacuzzi circuit board fuses


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08-08-17, 02:03 PM   #1 (permalink)  
Jacuzzi circuit board fuses

I have a 2003 Jacuzzi J-350. I had a FLO error. A technician replaced the circ pump and the flow switch which resolved the FLO issue but now I'm blowing the 1.5v/4a fuses on the circuit board. They do not blow right away, they go when I start both pumps. The new circ pump is the correct replacement part (as far as I can tell) and is wired correctly. The repairman wants to replace the circuit board. Could it be the transformer for the circuit board? I feel like the fuse issue has to be tied to the new circ pump as I never blew a fuse in 14 years. Any suggestions?

 
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08-08-17, 02:32 PM   #2 (permalink)  
Welcome to the forums.

A 4A fuse would not power the motor directly. It would be used for protection in the switching circuit.

I'd imagine if you had a transformer issue the display would be out.

Can you post the model or part number off the control board.
It may be a Balboa unit.


~ Pete ~

 
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08-09-17, 06:43 AM   #3 (permalink)  
The board says:

Controller 850 LCD
PWA 850-NT 09203040355
P/N 6600-092 Rev D

I understand the 4a fuse is for the circuit board power not for the pumps. Also the fuse blowing is intermittent. On Saturday, I added chemicals and ran the pumps no problem. In the evening (hours later), I started the pumps to use the spa and the fuse blew???

 
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08-09-17, 02:44 PM   #4 (permalink)  
Exactly which fuse is blowing ? I think there are five on the board. It will be labeled.
I'm guessing one of the plastic ones just below the relays.

If that is correct.... what is connected to that four pin white connector labeled J4?


~ Pete ~

 
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08-10-17, 07:54 AM   #5 (permalink)  
The fuses in question are labeled F(1) and F(2). They are the 125v fuses on the board under the J4 connector. F(2) blew first. After I replaced F(1), F(2) blew a week later.

 
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08-10-17, 09:07 AM   #6 (permalink)  
F1 and F2 are the transformer secondaries protection fuses. They should be 4A slow blow fuses.


~ Pete ~

 
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08-10-17, 10:22 AM   #7 (permalink)  
Agreed. Why are the blowing, bad transformer or bad circuit board or??

 
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08-13-17, 08:35 AM   #8 (permalink)  
Pete, any suggestions on troubleshooting to identify the cause of the subject fuses blowing?

 
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08-13-17, 12:33 PM   #9 (permalink)  
I'm trying to find a wiring diagram for that board. I should have some info for you by tonight.


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08-13-17, 05:39 PM   #10 (permalink)  
Thanks.

This is what I have, page 45:

http://www.lpsbathandspa.com/2003%20LCD%20Manual.pdf

 
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08-15-17, 06:22 AM   #11 (permalink)  
Pete - Did you find anything?

 
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