Hayward Plastic Water Pressure Switch | FDXLWPS1930
Product Overview
What pool techs reach for when a Hayward H-Series heater fails to ignite due to flow errors.
The Hayward FDXLWPS1930 is the OEM replacement water pressure switch designed specifically for Universal H-Series Low NOx heaters. In our experience, this plastic-bodied switch reliably handles the pressure monitoring required to ensure the heater only fires when adequate water flow is present. In regions with high mineral content, these switches can become scaled over time, making this genuine Hayward part a proven choice for restoring reliable ignition cycles.
Benefits & What Makes It Different
OEM Fitment
This genuine Hayward part ensures exact fitment and calibration for Universal H-Series Low NOx heaters, preventing the 'LO' error code common with faulty switches.
Safety Interlock
It acts as a critical safety component that prevents the burner from igniting without sufficient water flow, protecting the heat exchanger from dry-firing damage.
Corrosion Resistance
Engineered to resist corrosion from pool chemicals, this black plastic switch replaces older units that have developed internal diaphragm leaks or mineral buildup.
Compatibility
- Hayward Universal H-Series Low NOx Heaters (H150FD, H200FD, H250FD, H300FD, H350FD, H400FD)
- Systems requiring Hayward part number FDXLWPS1930
When To Use This
Pro Tip
When installing, use a small amount of Teflon tape on the threads, but be careful not to over-tighten the plastic housing, as it can crack the header or the switch body itself.
Common Questions & Instructions
How do I know if my Hayward heater needs a new FDXLWPS1930 pressure switch?
If your heater displays a 'LO' or 'S1' error code and won't ignite despite the pump running at full speed, the pressure switch is likely stuck open or failed due to internal scaling.
Can I install the Hayward FDXLWPS1930 myself or do I need a technician?
While it is a relatively simple screw-in part, it involves working near electrical terminals; homeowners comfortable with basic tools can DIY, but ensure the power is off before starting.
Why should I choose the OEM Hayward switch over a generic aftermarket version?
Generic switches often have different PSI trip points, which can lead to intermittent firing or safety bypasses that risk damaging your expensive heat exchanger over time.
Delivered today to your DFW neighborhood
Order this item by 2 PM Central on a weekday, and we'll have it on your driveway by evening. Same-day delivery is FREE to every ZIP in our DFW coverage area — no minimum — or it's free with our weekly service plan.
