Zodiac Jandy High Limit Temperature Sensor Kit for JXi 260/400 Heaters — Dual 135°F/150°F Safety Switches

The Zodiac Jandy High Limit Temperature Sensor Kit (R0592300) is a direct replacement sensor assembly for JXi 260 and 400 series heaters that shuts down fuel flow if water temperature reaches unsafe levels.

This high-limit sensor kit is designed to prevent pool or spa water from exceeding safe operating temperatures in compatible Jandy JXi and LXI heater models. It includes a dual-switch sensor that activates at preset thresholds to interrupt the gas supply and protect the heater and plumbing from overheating. The unit is compact, simple to install for experienced DIYers, and matches OEM specifications for a reliable fit in the listed heater models.

How does the sensor stop overheating in my JXi heater?

The kit uses two thermal switches set to trigger at 135°F and 150°F. If water temperature climbs above these points, the switches open the gas circuit to stop combustion and prevent further temperature rise. This mechanical cutoff is a safety layer that works independently of electronic controls.

• Dual-switch arrangement: one at 135°F, one at 150°F
• Interrupts gas supply when thresholds are reached
• Mechanical action—works even if other electronics fail

Which heater models are compatible with this replacement sensor?

This R0592300 assembly fits a broad range of Jandy JXi and select LXI/Legacy heaters. It is specifically compatible with JXi 200, 260 and 400 family models and their ASME variants listed by the manufacturer. Always verify your model number against the included compatibility list before purchasing.

• Fits JXi models: 200, 260, 400 series (multiple suffixes)
• Supports JXi ASME models: 260NC/PC and 400NC/PC
• Can replace sensors in many LXI and Legacy heater units

Is installation something I can do myself, and will it affect my warranty?

Installation is straightforward for someone experienced with pool heater service: it requires accessing the heater control compartment, removing the old sensor, and seating the new assembly in the original location. However, altering internal components can affect warranty coverage in some cases, so review your heater manual or consult your dealer beforehand.

• Basic mechanical replacement—no advanced electronics required
• Follow manufacturer torque and sealing instructions for safety
• Check warranty terms before self-installing

What performance and safety details should I expect from this sensor?

The R0592300 is built to Jandy OEM standards with a snug fit to maintain correct thermal sensing and reliable switch actuation. Because it’s a high-limit device, its role is safety-focused rather than temperature regulation—its purpose is to stop overheating events, not to control normal setpoint operation.

• OEM-spec thermal response for accurate cutoff
• Durable construction for long-term reliability
• Designed to maintain heater venting and prevent fault conditions

Who this is for: pool and spa owners, service technicians, and maintenance professionals who operate or repair Jandy JXi and compatible LXI/Legacy heaters and want a direct-fit, OEM-quality high-limit sensor to protect systems from excessive water temperatures. Choose this kit if you need a reliable safety cutoff that matches the original equipment form, fit, and function, and consult a qualified technician if you’re unsure about installation or warranty impact.