Jandy AquaLink RS Equipment Not Responding: Relay and Control Troubleshooting

Understanding the Relay System

The AquaLink RS Power Center uses plug-in relays to switch high-voltage equipment on and off. When you press a button on the control panel, the 24 VAC control circuit on the PCB energizes the appropriate relay coil, which closes the high-voltage contacts and powers the equipment. If any part of this chain fails, the equipment will not respond.

The system comes with four 3HP relays pre-installed. Additional optional relays can be added for auxiliary equipment. Each relay plugs into a labeled socket on the PCB: Filter Pump, AUX 1 through AUX 6, Spa Pump, Solar Pump, and Spa Heater.

Step-by-Step Troubleshooting

Owner-Level Checks

Verify the control panel shows a response

1. Press the equipment button on the control panel. Does the LED or display indicator for that function turn on? If yes, the control circuit is sending the command. The problem is downstream at the relay or equipment.
2. If the LED does not light up, the control panel may not be communicating with the PCB, or the button itself may be faulty.

Check the Emergency Service Switch

1. The Power Center has a Service Switch that can disable all relay outputs. Make sure it is in RUN mode, not SERVICE mode.
2. In Service mode, the control panel will still appear to accept commands, but no relays will energize.

Tech-Level Checks

Inspect relay connections

1. Open the Power Center and locate the relay for the non-responding equipment. Relays are labeled on the PCB.
2. Verify the relay is fully seated in its socket. Push it firmly into place. A relay that has vibrated partially out of its socket is one of the most common causes of equipment not responding.
3. Check that the correct relay is in the correct socket. The pool pump relay goes in the far-left socket, spa pump after AUX 6 on the right.

Test the relay

1. With the system powered on, press the equipment button and listen for an audible click from the relay. A click means the PCB is energizing the coil.
2. If you hear the click but the equipment does not run, the relay contacts may be burnt or welded. Replace the relay.
3. If there is no click, swap the suspect relay with a known-good relay from another socket. If the equipment then works, the original relay was bad.
4. If swapping relays does not help, the PCB socket or the PCB output driving the relay coil may be faulty.

Check DIP switch settings

1. S1 DIP #1 ON reassigns AUX 1 to cleaner mode. In cleaner mode, the cleaner will not turn on until the filter pump has been running for 3 minutes. It also turns off during spa mode and spa spillover. If the cleaner appears unresponsive, this is normal behavior.
2. S1 DIP #2 ON reassigns AUX 2 to control the low speed of a two-speed filter pump. If AUX 2 is not controlling the expected equipment, check this switch. You must also install a Jandy Two-Speed Relay for this to work.
3. S1 DIP #3 ON (dual equipment) reassigns AUX 3 to spa spillover mode. The AUX 3 relay socket should be left empty when this is enabled.

Test valve actuators (JVA)

1. Jandy Valve Actuators (JVAs) plug into dedicated 24 VAC sockets on the PCB: Intake, Return, Cleaner, and Solar JVA.
2. If a valve is not moving, verify the JVA cable is plugged in at the PCB end. Do not coil excess JVA cable inside the Power Center. To shorten the cable, remove the JVA lid, disconnect the cable, cut to length, strip, and reconnect.
3. Listen for the JVA motor running when a valve command is issued. If you hear nothing, the JVA motor may be failed or the 24 VAC output from the PCB socket may be dead.
4. Measure 24 VAC at the JVA socket when the command is active. If voltage is present but the JVA does not move, replace the JVA.

Verify high-voltage wiring

1. Trace the wiring from the relay output to the equipment. Look for loose wire nuts, disconnected leads, or corroded connections.
2. Confirm the equipment itself is functional by testing it with direct power (bypassing the relay) if safe to do so.
3. Check that the high-voltage relay plugs are connected to the correct sockets per the wiring diagram on the inside of the Power Center door.

Common Parts That Fix This Problem

• 3HP relay (Jandy replacement relay, 25A at 240 VAC)
• Jandy Valve Actuator (JVA) if the valve motor has failed
• Jandy Two-Speed Relay (required when S1 DIP #2 is ON for two-speed pump control)
• Power Center PCB (if relay sockets or control outputs are damaged)

Programmatic Equipment Behaviors to Know

• Cleaner 3-minute delay: When S1 DIP #1 is ON, the cleaner will not activate until 3 minutes after the filter pump starts. This ensures the system is primed.
• Cleaner turns off in spa mode: When the system switches to spa circulation, the cleaner automatically turns off.
• Cleaner turns off during solar activation: The cleaner turns off for 3 minutes when solar is activated to allow air to purge from the system.
• Cleaner turns off during spillover: Spa spillover mode also disables the cleaner.
• Heat pump delay: When S1 DIP #8 is ON (heat pump mode), the heater will remain OFF for 5 minutes after the thermostat setpoint is reached. With a gas heater (DIP #8 OFF), this delay is 3 minutes.