When your Dometic absorption refrigerator stops cooling and you have traced the fault to a blown thermal fuse, this is the OEM replacement assembly you need. Part number 3851409023 is the factory Dometic thermal fuse assembly designed to protect the burner and heating element circuit from overtemperature conditions. Swapping this part restores the safety circuit and gets your fridge back to temperature -- without replacing the entire cooling unit.
Dometic two-way and three-way absorption refrigerators use a thermal fuse as a one-shot safety device in the heating circuit. If the boiler area or flue stack reaches an unsafe temperature -- caused by a blocked flue, restricted ventilation, a failing heating element, or an extended tilt beyond spec -- the thermal fuse opens the circuit permanently. The fridge stops cooling, but potential fire or damage to the cooling unit is prevented.
Because a thermal fuse is a sacrificial component, it cannot be reset. Once it blows, it must be replaced. Dometic part 3851409023 is the correct OEM assembly for this job on a wide range of RM, NDR, and NDA series units. Using an OEM assembly ensures the replacement fuse carries the correct trip temperature rating and that the lead wires, connectors, and insulation sleeve all match the original installation.
Factory part number 3851409023 -- exact-fit replacement with correct trip rating, wire length, and connector termination for Dometic absorption refrigerators.
Thermal fuses open permanently when the boiler or flue area exceeds the rated temperature. This protects the cooling unit and surrounding cabinetry from overtemperature damage.
Compatible across a broad range of Dometic RM, NDR, and NDA series two-way and three-way absorption refrigerators commonly found in Class A, Class C, fifth wheels, and travel trailers.
Accessible from the exterior refrigerator vent panel on most Dometic installations. No refrigerant handling required. Basic hand tools and a multimeter are all you need.
Before installing a new thermal fuse assembly, it is critical to identify and correct the root cause. A thermal fuse does not fail on its own -- it opens because the temperature at its mounting location exceeded its rated limit. Common causes include:
Simply replacing the fuse without addressing the root cause will result in the new fuse blowing again, often quickly. Inspect the vent path, check the heating element resistance, and verify level operation before powering the refrigerator back on.
On most Dometic RM-series refrigerators, the thermal fuse is mounted on or near the boiler tube assembly at the back of the unit, accessible by removing the exterior upper or lower vent panel. The procedure is generally:
Dometic absorption refrigerators are organized into several product families found in RVs across all classes and sizes. The thermal fuse assembly is a common wear-and-service part across these families:
If your Dometic refrigerator abruptly stopped cooling -- especially after a trip where the rig was parked on a slope or a vent screen was blocked -- and the control board and heating element check out, a blown thermal fuse is the single most common culprit. This OEM assembly is the correct factory fix.