De Dietrich S44698 Elmwood NTC temperature sensor

The De Dietrich S44698 Elmwood NTC temperature sensor is a spare part listed under the Temperature NTC sensors category. NTC sensors of this type are used in boiler and heating systems to measure water temperature at various points – for example, flow, return, cylinder, or outdoor temperature – and send that signal to the control board. The control board then uses the resistance change of the sensor to modulate burner output, adjust mixing valves, or manage charging cycles. Without accurate temperature feedback, the system cannot regulate properly. When selecting a replacement NTC sensor, the key parameters are the resistance characteristic (commonly 10 kΩ or 12 kΩ at 25 °C, but other values exist), the probe form (immersion type for direct contact with water, clamp-on for pipe surface, or sleeve-mounted), cable length and connector type, and the response curve. Engineering data for this specific article – such as its exact resistance at 25 °C or probe form – should be verified against the boiler’s control board requirements. Typical failures on such sensors include a drifting characteristic that causes incorrect modulation, a broken cable, or poor thermal contact between a clamp-on probe and the pipe. Before fitting, check that the new sensor matches the original in connector and that the probe is clean and seated properly in its pocket or clamp. The part is branded De Dietrich; always confirm the manufacturer code S44698 / 336.220.007 against the existing part to ensure it is the correct type for the application.