Hayward FDXLHLI1930 high limit kit for Universal H-Series Low NOx pool heatersHayward High Limit Kit, FDXLHLI1930 In stock$7699
Hayward FDXLHLI1930 high limit kit for Universal H-Series Low NOx pool heaters
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Hayward High Limit Kit, FDXLHLI1930

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$7699
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Quick overview

  • Genuine Hayward part The factory FDXLHLI1930 high limit kit, not an aftermarket substitute.
  • Universal H-Series Low NOx Matched to the 150 through 400 sizes in the Low NOx H-Series range.
  • A safety control, not a comfort setting The high limit opens the heating circuit when water temperature climbs past the safe point.
  • Supplied as a kit Comes as the assembly Hayward sells for this replacement, so you are not sourcing loose pieces.
  • A common no heat cause A failed high limit locks the heater out while the rest of the unit still looks healthy.
  • Check flow before you fit it High limits usually trip because water is moving too slowly, so clean the filter and confirm pump flow first.
Full description and specifications ↓

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Product details

The Hayward FDXLHLI1930 is the high limit kit for Universal H-Series Low NOx pool heaters in the 150 to 400 range. It is the genuine Hayward part, the same one the heater left the factory with.

What the high limit does

The high limit is a temperature safety. It watches the water leaving the heat exchanger and opens the heating circuit if that water gets hotter than the heater is designed to run. That single component is what stands between a flow problem and a damaged heat exchanger, so it is not something to bypass or jumper out.

Diagnosing before you replace

A heater that will not fire, or that fires and then shuts down after a few minutes, often points at the high limit. Before fitting a new kit, work through the flow side: a dirty filter, a closing valve, a clogged impeller or a pump running too slow will all push the heater into a high limit trip with a perfectly good switch. If flow is right and the heater still locks out, the high limit itself has failed and this kit puts it back.

Ordering

Confirm the model on your heater data plate is a Universal H-Series Low NOx unit in the 150 to 400 range so you get the right part the first time.

Specifications
Brand Hayward
Manufacturer part number FDXLHLI1930
UPC 610377073783
Type High limit kit
Part category Pool heater part
Fits Hayward Universal H-Series Low NOx heaters, 150 to 400
Shipping weight 0.3 lb
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

Which heaters does this fit?
Hayward Universal H-Series Low NOx heaters in the 150 to 400 range. Check the model plate on your heater before ordering.
What does the high limit actually do?
It is a temperature safety cutout. If the water leaving the heat exchanger gets too hot, the high limit opens the circuit and shuts the heater down before damage occurs.
My heater keeps tripping on high limit. Is the part bad?
Not always. Low flow is the usual reason a high limit trips, so check the filter, the pump and the valves first. Replace the high limit when the flow is good and it still cuts out, or when it has failed open and the heater will not fire at all.
Is this a genuine Hayward part?
Yes. It is the Hayward part FDXLHLI1930, the same kit fitted at the factory.
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