Jandy AquaLink RS DIP Switch Configuration: Complete Setup Guide

S1 DIP Switch Reference (All System Types)

Switch	OFF (Factory Default)	ON
S1 #1	AUX 1 controls any equipment	AUX 1 controls pool cleaner. Filter pump turns on with cleaner. 3-minute priming delay. Cleaner off during spa mode and spillover.
S1 #2	AUX 2 controls any equipment	AUX 2 controls low speed of a two-speed filter pump. Filter pump button becomes high speed. Requires Jandy Two-Speed Relay.
S1 #3	Pool/Spa Combo: not used. Pool/Spa Only: AUX 3 controls any equipment.	Pool/Spa Combo: AUX 3 controls spa spillover (leave AUX 3 relay socket empty). Dual Equipment: not used.
S1 #4	Heater cool-down operates normally	Heater cool-down disabled. Only turn ON for electric heaters or heat pumps that do not retain residual heat. Turn back OFF after service if changed temporarily.
S1 #5	Normal operation	Factory calibration mode. Temperature delays eliminated, solar temp displayed. Do NOT leave ON.
S1 #6	Combo: separate pool and spa heaters. Dual: separate heaters.	Combo: sharing one heater for pool and spa. Dual: pool and spa share the same heater. Change spare AUX to activate when filter pump is on in spa mode.
S1 #7	No solar system. Air temperature is displayed.	Air sensor becomes solar sensor. Air temperature no longer displayed. Adjustable Freeze Kit (Part #6996) must be installed for freeze protection.
S1 #8	Gas heater mode. After setpoint reached, heater off for 3 minutes.	Heat pump mode. After setpoint reached, heater off for 5 minutes.

S2 DIP Switch Reference

Switch	OFF (Factory Default)	ON
S2 #1	Solar heating priority. AquaLink RS can control solar heating if solar sensor is connected.	Heat pump priority. AquaLink RS controls a heat pump. Solar heating control is disabled.
S2 #2	Not used
S2 #3	Not used
S2 #4	Not used

Heat Pump Configuration Matrix

The interaction between S2 DIP #1, the solar sensor on the 10-pin terminal bar, and the RS-485 heat pump connection determines the system behavior:

S2 #1	Solar Sensor	RS-485 Heat Pump	Result
OFF	Not installed	Not connected	No solar, no heat pump. Extra AUX available.
OFF	Installed	Not connected	Solar heating with solar priority. No heat pump.
OFF	Installed	Connected	Solar heating with solar priority. Heat pump with heat pump priority.
ON	Not installed	Not connected	No solar. Mechanically connected heat pump with heat pump priority (limited).
ON	Installed	Not connected	No solar. Mechanically connected heat pump with heat pump priority (full).
ON	Installed	Connected	No solar. RS-485 controlled heat pump with heat pump priority.

Common Misconfigurations

Two-speed pump not working on low speed

S1 DIP #2 must be ON, and a Jandy Two-Speed Relay must be physically installed. If you turn the switch ON without the relay, AUX 2 will appear to control low speed on the panel but the pump will not actually switch speeds.

No freeze protection after solar install

When S1 DIP #7 is turned ON for solar, the air sensor is reassigned. The system loses its air temperature reading and therefore cannot detect freeze conditions. You must install the Adjustable Freeze Sensor Kit (Part #6996). This is the most commonly missed step in solar installations.

Heater runs too long after reaching setpoint

If S1 DIP #8 is ON (heat pump mode), the heater stays off for 5 minutes after reaching setpoint instead of 3 minutes. If you replaced a heat pump with a gas heater but forgot to turn S1 DIP #8 back to OFF, the system behavior will not match expectations.

Shared heater not switching between pool and spa

For dual equipment systems sharing one heater, S1 DIP #6 must be ON, and the JVAs must be plugged into the Intake, Return, and Cleaner JVA sockets. If S1 DIP #6 is OFF, the system assumes separate heaters.

AUX 3 relay not working (Pool/Spa Combo)

On Pool/Spa Combination systems, if S1 DIP #3 is ON for spa spillover, the AUX 3 relay socket must be left empty. The system uses the valve actuator instead of a relay for spillover. If a relay is plugged into AUX 3 with DIP #3 ON, it may cause unexpected behavior. On Dual Equipment systems, S1 DIP #3 is not used.