Jandy | R0456400 | Air Pressure Switch – Pro Series LXi/JXi Heaters

The Jandy R0456400 Air Pressure Switch is a genuine OEM replacement part engineered for use in Jandy LXi and JXi series low-NOx pool and spa heaters. It monitors the combustion air pressure and ensures safe blower/vent operation to maintain reliable ignition and heater performance. 

Key Features

• Factory specified air-pressure switch for Jandy JXi (200/260/400 kBTU) and LXi low-NOx (250/300/400 kBTU) heater models. Includes switch body, hose/tubing and mounting hardware for complete replacement. 

• Detects proper blower function and vent pressure; shuts down burner if pressure is outside safe range to prevent unsafe combustion conditions. 

• Genuine Zodiac/Jandy OEM part ensures compatibility and preserves manufacturer performance and warranty compliance. 

• Compact shipping weight (~3.1 lb) suitable for service-tech inventory. 

Product Overview
In the combustion system of Jandy Pro Series heaters, the R0456400 air pressure switch serves as a vital safety and control component by verifying that the air-blower/vent assembly is functioning properly and that the correct air pressure differential exists before allowing gas ignition. If the blower fails, the vent is blocked, or the pressure drops below the threshold, the switch prevents the burner from firing to avoid unsafe conditions.

When a heater experiences ignition lockouts, frequent blower cycling, or fault codes indicating “air pressure” or “vent failure,” this switch is commonly diagnosed and replaced. Because it’s an OEM-specified component, the R0456400 restores factory-intended functionality and ensures the heater can safely resume full operation. For pool service professionals or e-commerce catalog buyers, this part should be listed under “Heater Combustion Safety Parts – LXi / JXi Series” with emphasis on its role in blower/vent verification and safe ignition.