How To Isolate and Correct Compupool CPSC Problems


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If your Compupool CPSC Generator fails to work after initial installation or stops working after a period of time, there are a series of troubleshooting steps you can take before contacting the manufacturer. This guide covers a number of possible steps to identify your specific problem and get your CPSC Generator back into operation. If this guide does not isolate your problem, give Compupool a call at (888) 989-7258 x225 for further instructions.

Click here to view Compupool cell parts. 

Step by Step


Step 1

NO POWER - If the LED lights and display on your CPSC unit are all off, check for the following:
a - Blown fuse - See our guide on "How to replace a blown fuse on a Compupool CPSC Generator".
b - Mismatched power - Verify that the voltage coming into the unit is the same as how the unit is configured. If different, convert the wiring on the unit to match the supply voltage. See the front half of our guide on "How To Install an In-Line Salt Chlorine Generator" for further instructions.
c - Not grounded - Verify that a grounding wire has been installed to the grounding lug. See Step 17 of our guide on "How To Install an In-Line Salt Chlorine Generator".
d - Loose grey ribbon cable - Verify that the grey ribbon cable is plugged in tightly on both ends. See our guide on "How To Secure Ribbon Cable on a Compupool CPSC".
e - Check that wires are not near screws or crimped.

Step 2

BLANK OR FADING DISPLAY - If the LCD Display is blank or fading, you unit probably has a faulty diode or Zener diode. The LCD Printed Circuit Board [PCB] will have to be replaced. See our guide on "How To Replace a Compupool CPSC LCD Printed Circuit Board" for more instructions.

Click here to view Compupool power supply parts. 

Step 3

NO DISPLAY, ALL SIX LCD LIGHTS ON - This is usually an indication that you have 110V power coming into the unit and the unit is configured for 220V. Verify that your supply voltage is 110V and convert the unit's wiring from 220V to 110V. See the front half of our guide on "How To Install an In-Line Salt Chlorine Generator" for further instructions.

Step 4

NOT PRODUCING CHLORINE - The CPSC Generator produces tiny bubbles in the cell when the cell is running, If you don't see these bubbles or your unit is not maintaining adequate levels of chlorine (measured with test strips) check the following:
a -Chlorine Output Percentage - You may have your chlorine output level set too low. Move it to 100% and monitor the results for a couple of days. If your chlorine level gets too high, back the setting down.
b - Insufficient run time - Leave the unit on for a longer period of time. About 8-10 hours is typical but this will vary with your pool's water flow.
c - Water Fault light on - See Step #5
d - Only one polarity working - See Step #7
e - Plate(s) detached - See Step #12
f - Water chemistry is off - Have a local pool store check a sample of your pool water. If any of the water chemistry numbers are out of range, add the appropriate chemicals to bring them into range. Then shock the pool, set the chlorine output to 100% and run for the pool for 24 hours. Monitor the results and bump the run time down 2-4 hours and the chlorine output percentage by 10% with 2 days of cycling between increments. Continue until you reach the optimum chlorine production.
g - Cell needs cleaning - See Step #11
h - Low salt level - If the low salt light goes on, you do not have enough salt in your pool to produce chlorine and the unit will shut off. Add salt. See our guide on "How To Add Salt To Your Pool" for more instructions.

Step 5

WATER FAULT LIGHT ON - The Water Fault Light will illuminate on several conditions. Check the following:
a - Salt just added - The Water Fault light may turn on if salt was added but not completely dissolved before the CPSC unit was turned back on.
b - Salt level too low - The Water Fault light will illuminate if the salt level is below 2500 ppm.
c - Inadequate flow - Check the filter, skimmer and pump strainer baskets to make sure nothing is restricting water flow. Also check the settings of your diverter valves to make sure they are not cutting off all or most flow.
d - Loose cell plug - Make sure the cell plug is attached tightly. See Step #15.
e - Loose wire connections - Crimp the female connections slightly to tighten the fit around the connection terminals.

Click here to view Compupool cell parts. 

Step 6

OVER SALT LIGHT ON - Take a sample of your pool water into a local pool store and have it test for salt level. This unit works best at 3500 ppm. The light comes on at 6000 ppm. If your water is above 6000, dilute the water to attain a salt level of 4000 - 5000 ppm. The unit will operate at 6000 ppm, but it will draw more current and run hotter. Over time, running hot will reduce the life of the unit. See our guide on "How to Reduce the Salt Level In Your Pool".
If your salt level is good, the unit may need to be recalibrated. See our guide on "How To Recalibrate the Salt Level on a Compupool CPSC".

Step 7

NOT REVERSING POLARITY - Your unit has two LED lights for "Polarity 1" and "Polarity 2". They should alternate periodically to show that the power to the cell is alternating to help maximize the life of the cell. If the unit is stuck on one, try crimping the female connection on the cell plug to create a tighter fit around the connection terminal.

Step 8

DISPLAY READS "IDLE" - This is an indication that the internal timers have been selected. "Idle" appears when the unit is in between timing sequences. If you are wiring to an external timer you may want to change the timer setting from internal to external. See our guide on "How To Select Internal/External Timers on a Compupool CSPS".

Click here to view timers. 

Step 9

TEMP ALWAYS 69° AND SALT READING IS ALWAYS < 2500 - This is an indication that the electrode and LCD Printed Circuit Board need to be replaced. See our guide on "How To Replace a Compupool CPSC LCD Printed Circuit Board" for more instructions.

Step 10

DISPLAY READS "Not Genuine - Call Dealer" - If this message comes up, check the following:
a - Loose cell plug - Make sure that the cell plug is securely attached to the cell head. See our guide on "How To Clean a Corroded Salt Chlorine Generator Cord Head".
b - Loose connection - Try crimping the female connections slightly on the cell plug to create a tighter fit around the connection terminals.
c - Wrong Cell ID - Go through the Cell ID Instructions. See our guide on "How To Implement the Cell ID Instructions for a Compupool CPSC".
d - Bad LCD PCB - If the unit is locked up and will not power on, the LCD PCB needs to be replaced. See our guide on "How To Replace a Compupool CPSC LCD Printed Circuit Board" for more instructions.

Click here to view Compupool power supply parts. 

Step 11

BUILDUP ON CELL - If you see significant buildup on the plates of the cell you need to clean the cell and check for contributing conditions to reduce further buildup. For instructions on cleaning the cell, see our guide on "How To Clean a Compupool Salt Generator Cell". Here's a list of contributing conditions to check:
a - Not reversing polarities - Make sure the unit is reversing polarities. See "Not Reversing Polarities" in Step 7 above.
b - Loose plates - Inspect the plates in the cell to make sure that they are all secure.
c - Bad Water Chemistry - Ensure that the water chemistry is always maintained within ranges.

Click here to view Compupool cell parts. 

Step 12

LOOSE ELECTRODE PLATE - If your water chemistry is not maintained consistently, or you do not clean the buildup off the cell plates, the plates will corrode and separate from the cell brackets. When this occurs, the cell will have to be replaced. It is very important to maintain water chemistry in your pool to extend the life of the unit's cell.

Step 13

CELL LEAKING AT TERMINAL BOLTS - If the cell is leaking through the terminal bolts, the cell has to be replaced.

Step 14

CELL LEAKING AT UNION - Check the union O-ring for wear and cracks. Replace if necessary. Re-lube the O-ring and make sure the collar is tight. Hand tightening should be sufficient. Do not over tighten.

Step 15

MELTED CELL PLUG - Make sure all plates are secure and connected to the brackets at the cell head. If not, replace the cell. For instructions on correcting the melted cell plug, see our guide on "How To Clean a Corroded Salt Chlorine Generator Cord Head".

Click here to view Compupool cell parts. 


(41 to 80 of 105)

InyoPools Product Specialist  Posted: 5/6/2017 

Hazmat - Make sure all your cable connections are tight. You might crimp the female terminals slightly to ensure they are secure on the cell terminals. If your cell hasn't been cleaned recently, clean it with acid. And, have the salt level checked independently to make sure yopur salt reading is correct.

 Posted: 5/3/2017 

My "add salt" light stays on but salt level is fine (3500-4000) and unit is producing chlorine. What's wrong?

InyoPools Product Specialist  Posted: 5/2/2017 

Fred - It sounds like you have a short somewhere. Make sure your cable is not cut. Take the cover off the control unit and look for any flash marks. Look for loose wires. Then turn on the power and look for sparking around the components.

InyoPools Product Specialist  Posted: 5/2/2017 

wazza – (Sorry for the delay. This response was placed in the wrong HTG). Check that the cable leads to the head of the cell are firmly connected. You might have to clean them and possibly crimp the female terminal slightly to get a solid connection.

 Posted: 4/30/2017 

Circuit protector trips every time every time module is energized energized

 Posted: 4/27/2017 

Our system has been switched off for a few months due to pool having to be emptied.
When it is plugged in again the display it has power as the display lights up but no other lights come on. I pressed the right output button and the pump came but the display read "only pump on" it would turn off when the LH output button was pushed


InyoPools Product Specialist  Posted: 4/21/2017 

Michelle - Have a pool store check your salt level. The Water Fault light will illuminate if the salt level is below 2500. Check for a restriction in the water flow at the strainer and skimmer baskets and in the impeller. Make sure the cable connectors at the cell head are tight. Slightly crimps the female connectors for a tighter connection.

InyoPools Product Specialist  Posted: 4/21/2017 

Reliablepool - Your control unit may not be "seeing" your cell. Make sure the cable connections are tight. Try crimping the female ends on the cable slightly to make a tighter connection. Make sure the cable has not been cut or damaged. If the cell has not been cleaned for a while, I would clean it, and check that the plates in the cell have not separated due to corrosion. Make sure your pool's water chemistry is balanced.

 Posted: 4/20/2017 

The Water Fault light is on and the display shows No Water. The cell has water flowing through it and I can see the little bubbles producing from the cell. I have checked and cleaned skimmers and backwashed the system but its still saying there is a problem.

 Posted: 4/20/2017 

My power u it reads "no cell".....
Any ideas?


InyoPools Product Specialist  Posted: 4/17/2017 

Ani - Check your salt level. If it is below 2500 ppm, the water fault light will come on. Check the connections in the cell plug. Crimp the female connectors slightly to make sure you have a tight fit. The cell may not be getting sufficient water flow at the VS lower RPMs. Raise the RPMs slightly while the SCG is generating chlorine.

InyoPools Product Specialist  Posted: 3/3/2017 

MikeL - You may have a loose connection where the cell plug fits the cell. Try crimping the female connectors on the cell plug slightly to create a tighter fit around the connection terminals.

 Posted: 3/2/2017 

I have a 6 year old RJ 30. I replaced the salt cell in September. I received an error message "non genuine call dealer" in the middle of February. Just replaced the cell with a new one and I still have the same error message. Any recommendations on what to do next?

InyoPools Product Specialist  Posted: 2/2/2017 

Chris - You might consider controlling your SCG with an external timer. See our guide on "How To Install an Intermatic T104 Timer". Note, the T104 timer is used with 230V. If your system uses 115V, you would want to install a T101 timer.

 Posted: 2/1/2017 

Hi, I have a CPSC24, which is about 5yo. I use the internal timer, but it is connected onto tariff 33, so the power is out for a few hours each evening. This has not been a problem until last week, when the unit now starts up with "power off" on the screen rather then "idle". It is still retaining the timer settings, but i have to manually turn the unit on every day.

InyoPools Product Specialist  Posted: 1/24/2017 

Will - To manually switch polarities, hold down the "Up Arrow" for 3-5 seconds until the display reads "Cleaning". If the polarity does not change, try crimping the female connectors on the cell plug to create a tighter fit around the connection terminals. Try manually switching the polarity again. If the polarities still do not switch, the LCD may need to be replaced.

 Posted: 1/20/2017 

How long does the cell stay on polarity 1 before it changes to polarity 2. Mine only seems to be producing chlorine when polarity 2 light is on.

InyoPools Product Specialist  Posted: 1/17/2017 

Brad - We don't have any information on this specific on/off problem. Make sure the connections between the head of the cable and the terminals on the cell are tight. Crimp the female leads in the cable head slightly to provide a good connection. Clean the connection if required. If you haven’t cleaned the cell in a couple of years and you see buildup on the plates, clean the cell. Otherwise, you may be looking at replacing the cell or the main PCB.

 Posted: 1/15/2017 

My CompuPool unit is about 5 years old and just started turning itself on and off repeatedly and won't stop. Any suggestions?

InyoPools Product Specialist  Posted: 11/15/2016 

"CLEANING" - Make sure all your connections to the cell are tight. Crimp the female ends of the cable connectors slightly so they fit snugly to the cell terminals. Clean your SCG cell with an acid solution. Make sure all the connectors to the PCB are secure especially the gray ribbon.

Anonymous  Posted: 11/14/2016 

my display screen is reading Cleaning after installing new circuit board doesn't look like system is making chlorine. any suggestion on how to correct the problem?

InyoPools Product Specialist  Posted: 7/23/2016 

Pete - Your SCG will use more current if the salt level is too high. Check that your water chemistry is balanced and your pool's salt level is within the approved range. Also check that the connections on the cell cable are tight. Crimp the female leads slightly to make sure they are connected to the terminals tightly.

 Posted: 7/20/2016 

Over Current is on my display and the generator is very hot and so is the cable. I replaced the salt cell but it did not solve my problem. Any help? Thank you!!

InyoPools Product Specialist  Posted: 7/11/2016 

DJ - I don't know what a Rj45 is but since you came in on a CPSC How To Guide, here's a link to the CPSC's Owner's Manual. If this isn't the correct manual, go to the bottom of our user page under "Resources" and click "Owner's Manuals" for a large list of Manuals by manufacturer.

 Posted: 7/8/2016 

I have an Rj 45 about 5 years old. Started out working fine this summer. Now there are no lights and it is not working pushed the reset button but nothing. Is there a fuse ? If so how do I get to it to check it. I do not have the manual.

InyoPools Product Specialist  Posted: 7/7/2016 

Ray - Many of your apparent system problems may be due to your bad cell. I'd replace the cell first and see if that corrects all your system problems.

 Posted: 7/4/2016 

I have a CPCS24 and know my cell is bad because one plate is detached. My display has been very dim for a while and none of the 6 LCD's light up. It reads no water and there is water flow. It was saying low salt for a while but the salt tested ok. It hasn't been making chlorine for a month or two before the plate came loose. Should I replace the PCB? The unit is 7 years old and used year round.

InyoPools Product Specialist  Posted: 6/20/2016 

Al - Make sure your cell is clean. Make sure your connections to the cell are tight. Crimp the leads slightly to tighten them up. Then look at replacing the cell if it hasn't been changed in 7 years. If none of this works, you are probably looking at replacing the main PCB.

 Posted: 6/16/2016 

I have a 7 year old CPSC24. The unit has recently started showing a flashing, "Cleaning 100%" then it goes off. Display flashes from time to time with the same cleaning text, but WILL NOT REMAIN ON consistently!

Suggestions? Do I need a new mother board?



InyoPools Product Specialist  Posted: 6/13/2016 

Rodney - It sounds like you may have to reset your Cell Type in the User Menu. Here is the link to the CPX Owner's Manual. See Troubleshooting Problem, "Low Salt LED on upon startup when known salt level is correct", at the bottom of page 24. Then go to pgs 19 and 20 for instructions for changing the "Cell Select" in the User's Menu.

 Posted: 6/11/2016 

My system doesn't seem to be generating chlorine. I've had my water tested at two different stores with similar results. Both have my salt at 3600 PPM and chlorine at zero. All other levels are good or just slightly over/under. I have the Compupool generator at 100%. Also the low salt indicator is always on and the test results when the unit turns on displays "< 2600 ppm".

This started happening last year. I've had the system for 6 years now and up until this point have had no problems. Thinking that the issue was with the cells, I purchased new cells over the winter and installed them this year when I opened the pool. Any thoughts/advice is greatly appreciated. Thanks in advance!


InyoPools Product Specialist  Posted: 5/31/2016 

Victor - Try crimping the female leads at the cable connection to the cell. If that doesn't work, you may have to replace the LCD board.

 Posted: 5/28/2016 

Hi, have a Compupool CPSC24, 5 yearsold. When the polarity is on 1 the unit does not produce chlorine and the water fault light is illuminated red, when polarity is on 2 chlorine is produced and light turns off. Any idea what could be causing and how to correct?

InyoPools Product Specialist  Posted: 5/9/2016 

budro - Make sure all your cable connections are tight. You might have to crimp the female ends of the cable terminals slightly. Make sure your cell is clean. Then call Compupool at 888-989-7258. You may need a new display PCB or a new main PCB.

 Posted: 5/4/2016 

Add salt light will not go off even when the salt level is high in the pool.

InyoPools Product Specialist  Posted: 4/19/2016 

Dutch - Check your salt level. If it is way high, your system may be drawing more amps that it should. You might also have a faulty main PCB, but call Compupool first at 888-989-7258 and have them verify this before ordering a new board.

InyoPools Product Specialist  Posted: 4/19/2016 

Barcong - You may have a faulty main PCB. Call Compupool first at 888-989-7258 and have them verify this before ordering a new board.

 Posted: 4/18/2016 

Hello. I have a CPSC36. It blew a fuse. I replaced it and the new one blew. I replaced it one more time with the same result. I inspected the motherboard and the plates. I could not see anything amiss. Direction please.

 Posted: 4/17/2016 

My Compupool CPSC Generator has stopped working after two years. When I turn on the switch that sends power to the unit (not the power button on the unit), all six LCDs light up for about 5 seconds, then go dark. The LCD display does not show a 3 minute self-test or show the system’s Output Percentage. The display shows 12:00AM and says “NO POWER”. If I leave the external power switch on, the clock on the display counts the passage of time. Pushing the power button quickly, or holding it in for 10 seconds and releasing it, does nothing. Neither does pushing the other buttons. Regardless of what I push, the display still shows time and says “NO POWER.” Any suggestions?


InyoPools Product Specialist  Posted: 4/14/2016 

CPSC chlorine generation - One common problem with this system is a loose connection. Check the terminals at the head of the cell. To make sure you have a tight connection at each of the three terminals, crimp the female leads slightly. If your cells is more than 4 years old, it may be time to replace it. The safest way to isolate the problem, after you have gone through this guide, may be to have the pool store professional evaluate the system.