Jandy AquaPure AquaLink RS Integration: JA, Jb, and EC Codes

Technical Guide • Updated March 2026

Quick Summary

JA = AquaLink RS is online and controlling the AquaPure's chlorine output percentages.
Jb G = AquaLink RS is controlling the AquaPure and Boost mode is active.
EC = External Control. An ORP unit or external controller has shut off chlorine production.
These are status indicators, not error codes. They tell you an external system is managing the AquaPure.
The PureLink model integrates directly into the AquaLink RS power center; the standalone AquaPure connects via RS-485 communication cable.

Understanding the Letter Codes

JA - AquaLink RS Online

When the AquaPure displays "JA," the AquaLink RS automation system is online and actively controlling the chlorine production rate. If you press the arrow buttons (A or B) on the AquaPure user interface, the display shows "JA" to indicate that production rate changes must be made through the AquaLink RS control panel, not at the power center.

To adjust the production rate while AquaLink RS is online, you must put the AquaLink into Service Mode first:

On the AquaLink RS control panel, press the Mode Select button to enter Service Mode. The Service indicator light turns ON.
Press the Valve Select button to choose Pool Mode or Spa Mode (each has an independent chlorine production setting).
Press the Filter Pump button to turn on the pump and apply power to the AquaPure.
On the AquaPure user interface, press arrow buttons A or B to adjust production rate in 5% increments.
On the AquaLink RS, press Mode Select to go to Time Out mode, then again to return to Auto mode. The system must cycle through SERVICE, TIME OUT, and back to AUTO to accept the new settings.

Jb G - Boost with AquaLink RS

When the display shows "Jb G," the AquaLink RS is online and Boost mode is active. The cell is running at 100% production for 24 hours of operation time. The Boost button on the AquaPure user interface works regardless of whether AquaLink RS is online or offline.

To activate Boost: press and hold the POOL TEMP/BOOST button (D) for 10 seconds. The display will show "bo" flashing intermittently with a countdown of remaining hours. To cancel Boost, press and hold the button again for 10 seconds.

EC - External Control

The "EC" display means an ORP (Oxidation-Reduction Potential) unit or other external controller has shut off chlorine production. The AquaPure supports an external ORP/control interface via the connector on the Power Interface Board.

When an ORP controller is connected and determines that the chlorine level (measured as ORP) is adequate, it signals the AquaPure to stop production. This is normal automated operation, not an error condition.

If you see "EC" and do not have an ORP controller installed, check the jumper J14 on the Power Interface Board. This jumper must be in the correct position for your configuration. Refer to the manual's Figure 17 for the ORP jumper location.

AquaLink RS Communication Wiring

The standalone AquaPure connects to AquaLink RS via an RS-485 communication cable. The PureLink model has this connection built into the power center.

The communication cable connects from the AquaPure control center to the AquaLink RS power center (see manual Figures 14 and 15).
Power connection: The AquaPure draws power from the load side of the pump relay in the AquaLink system.
Communication connection: RS-485 two-wire connection between the chlorine generator and the AquaLink control system.
PureLink wiring is shown in Figures 16a (standard AquaLink RS network) and 16b (PDA control system network).

Pool vs. Spa Production Settings

When connected to AquaLink RS, the AquaPure maintains separate chlorine production rates for Pool Mode and Spa Mode. The AquaLink RS automatically switches between these settings when the system changes modes.

Use the Valve Select button on AquaLink RS to switch between Pool and Spa modes when adjusting production rates.
The system must be in Pool Mode to change the pool production rate, and in Spa Mode to change the spa production rate.
After making changes, cycle through SERVICE, TIME OUT, and back to AUTO to save the settings.

Boost Mode Details

Boost mode runs the cell at 100% production for 24 hours of actual operation time (not wall-clock time). If the pump runs 12 hours per day, Boost takes 2 calendar days to complete.

Use Boost after heavy rain, parties, heavy organic load, or whenever you need to quickly raise chlorine levels.
Boost can be activated from either the AquaPure user interface or through AquaLink RS.
After Boost completes, the system returns to the previously set production rate automatically.
Boost also overrides the low temperature cutoff (below 54°F), allowing production for 24 hours even in cold water.

Frequently Asked Questions

Can I use the AquaPure without AquaLink RS?

Yes. The standalone AquaPure operates independently with its own user interface. AquaLink RS integration is optional and adds remote control capability and pool/spa mode switching.

Why does the display show JA when I try to adjust production?

JA means AquaLink RS is controlling the system. To adjust from the AquaPure interface, put AquaLink RS into Service Mode first. Otherwise, make adjustments from the AquaLink RS control panel.

What is the difference between AquaPure and PureLink?

AquaPure is the standalone salt chlorine generator with its own control center. PureLink integrates the chlorine generator electronics into an AquaLink RS power center, eliminating the need for a separate control box. Both use the same electrolytic cell and sensor.

I see EC but I do not have an ORP controller. What should I check?

Check the J14 jumper on the Power Interface Board. If no ORP controller is installed, the jumper must be in the default position. Also check for any external control wiring connected to the ORP/External Control connector that may be sending a shutoff signal.