De Dietrich 83898703 anti-backflow thermostat

The De Dietrich 83898703 is listed as an anti-backflow thermostat, with catalogue article 336.805.003 and manufacturer codes 83898703 and 336.805.003. This entry falls under the thermostat category. Parts of this type are mechanical thermostats that act directly—they open or close a circuit when the sensed temperature reaches a set point, without needing a control board. They are often used as limit switches or safety cut-outs in a boiler or burner system. Such thermostats are selected by their switching point (the temperature at which they change state) and by the reset type: automatic reset returns to normal once the temperature drops, while manual reset requires a physical button press after a trip. The mechanical construction can be a disc, capillary, or bimetal element. When replacing a thermostat of this class, pay attention to the switching temperature and the reset behaviour to match the original part. Check also the connection method (spade terminals, flying leads, or fixed cable) and the probe form (immersion bulb, clamp-on, or surface-mounted). Typical field failures include a drifting switching point that causes the system to cycle incorrectly, a broken capillary or cable, or poor thermal contact with the pipe or vessel. Always verify the replacement’s temperature setting against the system’s safety requirements.