The heating element that warms the water can fail because of an electrical break or loss of insulation. A continuity test only covers part of the diagnosis and does not prove that it is safe.
Confirm which part is not working
Start with the conditions of a wash cycle that does not heat: program, water supply, and expected behavior. The water level, sensor, or electrical control may also be involved. Not all appliances include a water heater.
Technical diagnosis distinguishes an open circuit, faulty insulation, and no heating command. If it trips an electrical protection device, do not keep repeating cycles to link it to a phase.
Measurements and replacement part
Checks require model data, suitable instruments, and safe isolation. Continuity is not the same as proper insulation from the parts that must remain protected.
The replacement part must match in geometry, specifications, sealing, and applicable mountings. The temperature sensor may need its own inspection even if it is close to the heater.
Installation and validation
The Electrolux procedure for its documented heater includes draining beforehand and care with the seal. The rear access in that example is not universal.
Position, fasteners, connections, and watertightness must be restored according to the manual, and the planned electrical and functional checks must be performed. Tightening a gasket more does not guarantee a better seal. The air heater in a washer-dryer belongs to a different circuit and needs its own diagnosis.
A heater repair must validate both heating and electrical safety, as well as the seal of the tub that was worked on.