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Hayward H-Series FD Heater Vent Pressure Switch | FDXLVPS1930

Hayward Products SKU: FDXLVPS1930
Hayward Universal H-Series Low NOx Heater Not sure it fits? See this part on the interactive diagram Hayward Universal H-Series Low NOx Heater

Hayward H-Series FD Heater Vent Pressure Switch | FDXLVPS1930

Hayward Products SKU: FDXLVPS1930
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Hayward FDXLWPS1930 Water Pressure Switch for Universal H-Series FD Low NOx Heaters (FDXLVPS1930 / FDXLVPS1930 Reference)

The Hayward FDXLWPS1930 is an OEM water pressure switch used on Hayward Universal H-Series Low NOx “FD” pool heaters. This safety switch confirms there is adequate water flow/pressure through the heater before allowing it to fire. If water flow drops (dirty filter, closed valve, pump off, air in the system, etc.), the switch helps prevent heater operation to protect internal components from overheating.

Note on part number: Many people reference this as FDXLVPS1930, but the OEM part is commonly listed as FDXLWPS1930 (pressure switch for FD heaters).

Fits / Compatibility

  • Hayward Universal H-Series Low NOx FD heater models including: H150FDN, H150FDP, H200FDN, H200FDP, H250FDN, H250FDP, H300FDN, H300FDP, H350FDN, H350FDP, H400FDN, H400FDP
  • Also used on select ASME/commercial FD heater configurations (verify heater model/serial for exact match)

What It Fixes

  • Heater won’t fire due to a failed or out-of-range pressure switch
  • Intermittent heat cycles caused by unstable switch contact
  • Corroded, leaking, or damaged switch discovered during service

Key Features

  • OEM Hayward replacement for reliable fit and correct safety operation
  • Helps prevent heater operation when water flow is insufficient
  • Critical safety component that protects the heat exchanger from low-flow overheating

Installation Notes

  • Turn off power to the heater at the breaker before servicing.
  • Always troubleshoot the cause of low flow first (dirty filter, clogged baskets, closed valves, bypass settings, air leaks).
  • If your heater uses an adjustable pressure switch, adjust only per the heater service instructions after installation.
  • Installation should be performed by a qualified technician.

Specs (Quick Reference)

  • OEM Part Number: FDXLWPS1930
  • Part Type: Heater Parts (Water Pressure Switch)
  • Typical Use: Universal H-Series Low NOx FD Heaters
  • Warranty (typical OEM listing): 1-Year (Parts Only)

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Maintenance Tips

  • If the heater trips on flow/pressure, clean the pump basket and filter first—restricted flow is the most common cause.
  • Keep valves fully open and verify bypass settings after any plumbing changes.
  • Maintain balanced water chemistry to reduce scale inside the heater, which can restrict flow over time.
  • If flow issues persist, inspect for suction-side air leaks (loose lids, cracked fittings) that can reduce pressure through the heater.
Questions about returns? View our return policy.

Hours Of Operation:

Monday - Friday: 7:00 am to 5:00 pm Phoenix Time

Saturday: 8:00 am to 2:00 pm

Sunday: Closed

  • We do not ship on Saturday or Sunday.
  • Orders totaling more than $300 will require signature confirmation upon delivery.
  • We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
  • Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
  • Expedited shipping options are available at checkout.

Return Policy:

  • Products that are received damaged will receive a refund in store credit.
  • Most products are eligible for return within 30 days of receipt, except where noted below.
  • To initiate a return, please complete an RMA form prior to sending your item back.
  • Original shipping costs are non-refundable and will be deducted from the return credit.
  • Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
  • Some returns will be charged an automatic 15% restocking fee.
  • We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
  • Please complete the return form to receive your RMA number and return shipping label.
  • Chemical products are not eligible for return under any circumstances.
  • The Pentair Colorsync 618031 is not eligible for return.
  • Pool cleaners are not eligible for return.
  • Opened seals and o-rings are not eligible for return.
  • Capacitors are not eligible for return.
  • Plastic popup tools are not eligible for return.
  • Automation components and circuit boards are not eligible for return.
  • If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
  • Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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