De Dietrich Set of sensors (HL/NTC) S101771

The De Dietrich S101771 is a set of sensors comprising an HL (high limit) and an NTC (negative temperature coefficient) temperature sensor. It is designed for use in De Dietrich MCR 3 series boilers, including models 24s, 35s, 24t, 24/28 mi, 30/35 mi, and plus hybrid. This kit also fits De Dietrich M 40-s, DTG 130 Econox, C 230 Eco, C 310 / 610 Eco, DTG 230 Econox, DTG 120 Nez Diematic, C 210 Eco, MCR.MI, Domogas DGXE 14-47 (up to 04.95), DTG 220 Econox/II, DTG S 110 K, GT/GTM 110/1100 /Diematic, Domogas DGXECO/DGXE from 05.98, and Domogas DGXE 60 - 110. The sensors provide precise temperature control for efficient boiler operation.

Parts of this type are selected by matching the sensor's resistance curve (typically 10 or 12 kOhm at 25°C) to the boiler's control board. Before ordering, verify the sensor's mounting form (e.g., clip, screw-in, or immersion) and the connector type. Measure the resistance at ambient temperature and compare it to the expected value for the specific boiler model. Ensure the sensor's temperature range and response time are compatible with the application.

When NTC sensors fail, they often short or open, causing the boiler to display an error code or shut down. A faulty HL sensor may trigger a safety lockout or prevent the burner from igniting. Check the sensor's resistance with a multimeter; a reading far from the expected value indicates failure. Also inspect the wiring and connectors for corrosion or damage.