Hayward FDXLWPS1930 Water Pressure Switch Replacement for Universal H-Series Low NOx Pool Heater

Overview

The Hayward FDXLWPS1930 Water Pressure Switch is a purpose‑built sensor designed to work with Hayward Universal H‑Series Low NOx pool heaters. This model is specified for post‑2010 units and is engineered to interact with models H150FDN, H150FDP, H200FDN, H200FDP, H250FDN, H250FDP, H300FDN, H300FDP, H350FDN, H350FDP, H400FDN, and H400FDP. In the field, you may note that the assembly carries a weight of about 20 pounds, a sign of its sturdy construction and protective enclosure that helps withstand outdoor pool equipment environments.

The switch monitors the water pressure in the heater circuit and signals the control board when pressure falls within the expected range. Replacing a worn or drifted switch can help restore consistent cycling and reduce nuisance startup or shutdown events. While every installation is unique, this switch is designed to slot into Hayward’s H‑Series Low NOx ecosystem, preserving the intended interaction between sensor and control logic.

Compatibility and performance at a glance

The switch is designed for Hayward Universal H‑Series Low NOx heaters, with compatibility spanning multiple H models across FDP and FDN variants. This provides a convenient, common replacement part for several configurations and serials, which helps simplify service planning for pool professionals or confident homeowners who handle maintenance on their own equipment.

• Fits H150FDN, H150FDP, H200FDN, H200FDP, H250FDN, H250FDP
• Also fits H300FDN, H300FDP, H350FDN, H350FDP, H400FDN, H400FDP
• Post‑2010 production ensures updated electrical fittings and reliability
• Rugged 20 lb design supports durable operation in outdoor environments

What to expect during replacement and use

Careful handling and correct seating are key. Power down the heater and depressurize the system before work, verify model compatibility with your unit, and follow standard safety and installation practices. If you are not comfortable performing electrical work, consult a licensed technician to complete the replacement. With proper handling, this pressure switch can help maintain the intended response of the heater control system and support steady operation across seasonal use cycles.

• Power down and depressurize the system before work
• Verify model compatibility with your unit
• Follow standard safety and installation practices
• Consult a licensed technician if unsure

Installation and care tips

With a focus on durability and reliable sensing, ensure correct seating and orientation of the switch, inspect adjacent fittings for wear, and secure electrical connections according to the manufacturer’s guidance. Regular checks can help preserve sensor accuracy and overall heater performance as seasons change.