Hayward
Hayward Heater Thermistor FDXLTER1930 – Universal H-Series Low NOx Heaters
Hayward Heater Thermistor
Genuine Hayward replacement temperature sensor for compatible Universal H-Series Low NOx Forced Draft, ASME and H135 pool heaters manufactured through December 2020. Designed to monitor heater water temperature and support proper temperature control.
Warranty Information
1-Year Manufacturer Warranty
Ultimate Pools is your first point of contact for compatibility verification, installation guidance, and warranty support.
The Hayward Heater Thermistor (FDXLTER1930) is a genuine Hayward replacement temperature sensor designed for compatible Universal H-Series Low NOx pool and spa heaters. The thermistor monitors water temperature and communicates temperature information to the heater's control system, supporting temperature regulation during heater operation.
Designed for select Hayward Forced Draft, ASME and H135 heater models, this replacement thermistor is specified for compatible residential and commercial heaters manufactured through December 2020. It is used when servicing a damaged or malfunctioning heater temperature sensor. Manufacturing date verification is essential because Hayward identifies FDXLTER1931 for residential heaters manufactured January 2021 onward.
Key Features
Original Hayward thermistor designed for specified H-Series pool heater applications.
Measures heater water temperature for use by the heater's electronic control system.
Provides temperature information used by compatible heater controls to regulate heating operation.
Designed for select Hayward Universal H-Series Low NOx Forced Draft heater models.
Specified for compatible residential and commercial heater models manufactured through December 2020.
Suitable for replacing a faulty original thermistor after diagnosis by a licensed HVAC contractor.
Compatibility & Fitment
Compatible with the following Hayward pool and spa heater models, subject to the manufacturing date requirements outlined below:
- Hayward Universal H-Series Forced Draft / Low NOx Heaters: H150FDN, H150FDP, H200FDN, H200FDP, H250FDN, H250FDP, H300FDN, H300FDP, H350FDN, H350FDP, H400FDN, H400FDP.
- Hayward Universal H-Series ASME Forced Draft Heaters: H250FDNASME, H250FDPASME, H400FDNASME, H400FDPASME.
- Hayward H-Series H135 Above-Ground Pool Heaters: H135ID1.
Important Manufacturing Date Requirements:
- FDXLTER1930: Specified for compatible residential and commercial heaters manufactured December 2020 and earlier.
- FDXLTER1931: Specified for compatible residential heaters manufactured January 2021 and later.
- Hayward HDF Heaters: FDXLTER1931 is identified as the only compatible thermistor for HDF heaters. Do not order FDXLTER1930 for an HDF heater.
Compatibility may vary by production year, configuration and installation. Verify your exact model and part number before ordering.
Applications
- Replacement of faulty Hayward pool heater temperature sensors
- Hayward Universal H-Series Low NOx Forced Draft heater servicing
- Temperature sensor replacement on compatible ASME commercial heaters
- Maintenance of compatible Hayward H135 above-ground pool heaters
- Pool and spa heater temperature control system repairs
- Heater troubleshooting and thermistor replacement following professional diagnosis
Confirm the heater's manufacturing date before ordering. FDXLTER1930 is specified for compatible heaters manufactured through December 2020; later residential models and HDF heaters require verification of FDXLTER1931 instead.
Professional Installation Recommended
All service on gas appliances shall be performed by a licensed HVAC contractor. Thermistor diagnosis, replacement and heater servicing must follow Hayward's manufacturer instructions and all applicable electrical, plumbing, gas, bonding and building codes.
Before replacement, the licensed contractor should verify the heater model, manufacturing date and original thermistor part number. The heater must be safely shut down and isolated as required by the manufacturer before servicing. Proper sensor operation and heater safety functions should be verified before returning the unit to service.
Specifications
| SKU | FDXLTER1930 |
| Brand | Hayward |
| Product Type | Pool Heater Thermistor / Temperature Sensor |
| Product Series | Universal H-Series Low NOx, ASME Forced Draft and H135 |
| Function | Water Temperature Monitoring for Heater Control |
| Compatibility | Select Hayward Universal H-Series Forced Draft H150FD–H400FD, H250FD/H400FD ASME and H135ID1 heater models manufactured through December 2020. See Compatibility & Fitment for exact models and restrictions. |
| Manufacturing Date Requirement | December 2020 and Earlier, for Compatible Models |
| Later Residential Heater Part | FDXLTER1931 – January 2021 and Later |
| HDF Heater Compatibility | Not Compatible – FDXLTER1931 Required |
| Application | Pool and Spa Heater Temperature Sensor Replacement |
| Installation | Licensed HVAC Contractor Required |
| Warranty | 1-Year Manufacturer Warranty |
| Final Sale | Yes |
Frequently Asked Questions
The FDXLTER1930 monitors water temperature inside compatible Hayward pool heaters and provides temperature information to the heater control system. This information is used to regulate heater operation.
This thermistor is specified for select Hayward Universal H-Series Forced Draft, ASME and H135 heaters manufactured through December 2020. Refer to the Compatibility & Fitment section for the exact model numbers and manufacturing date requirements.
FDXLTER1930 is specified for compatible residential and commercial heaters manufactured December 2020 and earlier. FDXLTER1931 is specified for residential heaters manufactured January 2021 onward and is the only thermistor identified for Hayward HDF heaters. Always confirm the heater model and manufacturing date before ordering.
No. All service on gas appliances shall be performed by a licensed HVAC contractor. A qualified contractor should diagnose the heater, confirm the correct thermistor and complete the replacement in accordance with Hayward's instructions and applicable codes.
The Hayward FDXLTER1930 includes a 1-year manufacturer warranty. This replacement thermistor is final sale, so customers should confirm heater compatibility and manufacturing date before purchasing.
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