Replacement Zodiac R0011800 -12 Month Warranty - Electronic Temperature Sensor for Zodiac & Jandy Pool and Spa Heaters

Restore accurate water temperature monitoring in your compatible pool or spa heater with the Wholesale Sensors Replacement for Zodiac & Jandy R0011800 Electronic Temperature Sensor for Pool and Spa Heaters. Backed by a strong 12-Month Warranty and USA-based product support, this replacement temperature sensor is designed to provide dependable temperature feedback to the heater’s electronic control system, helping maintain proper heating performance and comfortable pool or spa water temperatures.

The R0011800 is an electronic temperature sensor, also commonly described as a thermistor or water temperature sensor, used in multiple generations of Jandy, Zodiac, and Laars pool and spa heating equipment. Its job is to sense water temperature and provide corresponding information to the heater control system. The control can then use that information as part of its normal temperature regulation process.

This Wholesale Sensors component is engineered as a perfect OEM-style replacement designed to meet or exceed OEM performance specifications for compatible R0011800 applications. The primary manufacturer part number is R0011800. Common catalog and cross-reference numbers associated with this sensor include 6203-061, 52333, 6203-061A, LAR-151-5186, and 47-295-1414. Additional distributor references can exist, so the original R0011800 number and exact heater model should be the primary fitment criteria.

One of the advantages of the R0011800 temperature sensor is its compatibility with several well-known pool heater families. Documented applications include Jandy Hi-E2 gas heaters, Jandy Laars Lite2 LD and LG gas pool and spa heaters, Jandy Laars LX and LT Low NOx heaters, and Teledyne Laars Series 2 ESG and ESC heaters.

For the Jandy Laars LX and LT Low NOx heater family, parts references document R0011800 applications covering equipment manufactured during the 1999-2003 and 2003-2007 periods. This makes the sensor an important replacement component for owners and technicians maintaining older pool heating systems where the original temperature sensor has deteriorated or failed.

The R0011800 is also documented across numerous older Laars heater configurations. These include select EPC 125 through 400, EPC-II 125 through 400, EPM 125 through 400, EPS 125 through 400, ES 125 through 400, ES-II 125 through 400, ESC 125 through 400, EPH 300, and additional related models. Specific Lite and Lite2 configurations include LD and LG heater sizes from 125 through 400, while LX and LT applications include select 250 and 400 models.

Because this sensor spans several heater generations, customers should not rely on the general Jandy or Laars brand name alone. Before ordering, compare the R0011800 part number, original sensor configuration, electrical connector, and complete heater model. Production revisions and control configurations can affect which temperature sensor is required.

The temperature sensor plays an essential role in heater operation. When pool or spa water moves through the heater, the sensor detects temperature and communicates that information to the electronic temperature control. Accurate feedback allows the control system to determine how the actual water temperature compares with the desired temperature setting.

When the sensor is operating correctly, the heater can respond appropriately as water approaches the selected temperature. When sensor information becomes inaccurate, intermittent, or unavailable, the heater control may no longer have reliable temperature information.

Potential symptoms of a deteriorating temperature sensor can include incorrect displayed water temperature, inconsistent heating, difficulty maintaining the selected temperature, unexpected heater cycling, or abnormal temperature control behavior. A sensor that provides an inaccurate resistance signal can make the control system interpret water temperature incorrectly.

However, these symptoms do not automatically prove that the R0011800 sensor has failed. Pool and spa heaters contain multiple components that can affect heating performance. Problems involving water flow, filtration, pressure switches, high-limit switches, electrical connections, control boards, ignition components, gas supply, circulation pumps, or other safety devices may create similar symptoms.

For this reason, proper diagnosis is recommended before replacing any heater component. If the displayed temperature appears incorrect, compare the heater reading with a reliable independent water temperature measurement. Inspect the temperature sensor wiring and connector for corrosion, loose terminals, damaged insulation, moisture, or broken conductors.

A technician can also evaluate the sensor’s electrical response according to the service information for the exact heater. Thermistors change resistance as temperature changes. If the measured response is outside the expected specification, remains fixed as temperature changes, or indicates an open or shorted circuit, replacement may be appropriate.

The R0011800 sensor is associated with installations that use a temperature sensor bulb, electrical leads and connectors, and a sensor sleeve. Original replacement descriptions also reference a gasket with the assembly. These components help position and connect the temperature-sensing element correctly within compatible heater systems.

Correct installation is important for accurate temperature monitoring. Before servicing a gas-fired pool heater, disconnect electrical power and follow the heater manufacturer’s safety procedures. Pool heaters combine electricity, combustible fuel, high temperatures, and circulating water, so service should be performed by a qualified technician when required.

Locate the existing temperature sensor and document its position, connector orientation, and wire routing before removal. Carefully disconnect the electrical connector without pulling directly on the wiring. Remove the existing sensor according to the heater service procedure.

Inspect the sensor mounting area and related sealing components during installation. The replacement sensor should be positioned in the same intended sensing location as the original so that it measures the correct water temperature. Make sure electrical connections are fully seated and route wiring away from excessive heat, sharp edges, and moving components.

After installation, restore the heater according to the manufacturer’s procedure and verify normal operation. Compare the heater’s temperature reading with actual pool or spa water temperature and monitor the system through a normal heating cycle.

Pool and spa heaters do not use automotive OBD-II diagnostic codes, so codes such as P0117 or P0118 do not apply to the R0011800. Depending on the heater generation, a Jandy or Laars system may provide heater-specific diagnostic information or exhibit operating symptoms instead. Always use the service documentation for the exact heater when interpreting a fault.

If a fault remains after sensor replacement, continue troubleshooting rather than assuming another temperature sensor is required. Verify circulation and water flow, electrical connections, heater controls, safety circuits, and other related components.

The Wholesale Sensors R0011800 replacement is built with a responsive temperature-sensing element, durable insulated wiring, and secure electrical connections for dependable performance in demanding pool and spa environments. Each sensor is rigorously tested for temperature response, electrical performance, continuity, connection integrity, and reliability before shipment.

Wholesale Sensors specializes in replacement sensing solutions for pool and spa equipment, HVAC systems, appliances, refrigeration equipment, automotive applications, RV systems, foodservice equipment, and industrial systems. Our focus is providing dependable aftermarket replacement components backed by knowledgeable customer assistance.

Every Wholesale Sensors Replacement for Zodiac & Jandy R0011800 Electronic Temperature Sensor is backed by a strong 12-Month Warranty and responsive USA-based product support. Whether you are repairing a Jandy Hi-E2, Laars Lite2 LD or LG, LX/LT Low NOx, Teledyne Laars Series 2, or another verified compatible heater, this replacement provides a dependable solution for restoring accurate water temperature feedback.

Before ordering, verify R0011800 against the original sensor and confirm compatibility with your complete heater model. With confirmed fitment, the Wholesale Sensors replacement provides accurate temperature monitoring, durable construction, rigorously tested performance, straightforward service replacement, and dependable support for your pool or spa heating system.