INDESiT IWE 71451 B ECO UK tripping

It does sound as if you’ve narrowed it down quite a bit. From what you’ve described, the fault is most likely connected with the motor circuit or wiring under load, rather than the heater.

A few sensible checks to do next:

1. Isolate it from the mains first Unplug the washer before inspecting or disconnecting anything internal. An RCD trip points to leakage to earth, so take care.

2. Recheck exactly when it trips You say it trips when the door is shut, but with the motor unplugged it will start a cycle without tripping. That strongly suggests the fault appears when the control board energises the motor circuit, not simply from closing the door.

3. Inspect the motor wiring loom carefully This is a very common one. Check the full loom from motor to main PCB for: - rubbed or broken insulation - wires chafing on the drum or cabinet - signs of burning at the motor plug or PCB plug - damp or carbon tracking in connectors

4. Check the motor carbon brushes If worn very short, they can create excessive arcing/carbon dust and sometimes contribute to tripping. Also inspect the commutator for heavy burning.

5. Check the motor to earth properly A motor can run on the bench and still be faulty. A simple “it runs” test does not rule out insulation leakage. Ideally test windings and the tacho wiring to earth with an insulation tester (Megger). The armature can leak only under mains conditions/load.

6. Consider the main PCB If wiring and motor test sound, the motor triac or suppression components on the control board may be leaking to earth or failing when the motor circuit is switched in.

One important point: do not bench-test washing machine motors directly from the mains unless you are fully competent, as it can be dangerous and misleading diagnostically.

If you can’t insulation-test the motor and loom, the next step may need a qualified appliance engineer. Any mains electrical work should be left to someone properly equipped.

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