Thermistor

The Hayward FDXLTER1930 thermistor temp sensor fits select Hayward H-Series Low NOx pool heater models made before 2020. If your heater is a 2020 or newer it will require the FDXLTER1931 thremister. Details: Hayward P/N FDXLTER1930 Genuine Hayward part Fits the following inground pool heaters made before 2020: Hayward Universal H-Series Low NOx H150FD Hayward Universal H-Series Low NOx H200FD Hayward Universal H-Series Low NOx H250FD Hayward Universal H-Series Low NOx H300FD Hayward Universal H-Series Low NOx H350FD Hayward Universal H-Series Low NOx H400FD Hayward Universal H-Series Low NOx H500FD Important To determine the manufacture date of your heater, check the manual or the label on the heater for the serial number. The 5th and 6th digits in the serial number indicate year of production, the 7th and 8th digits the month of production. All service on gas appliances is required to be performed by a licensed HVAC contractor. Please Note. Electronic and electrical pool heater parts are final sale.