Zanussi dryer shows E51 and may trip the breaker or fail to start the motor.

Safety first: Disconnect from mains. PCB and motor testing should only be done if you are competent with electrical diagnostics.

• 1. Visual inspection: Remove the top panel and locate the main control board. Look for burn marks or damaged components near the motor control area.
• 2. Check motor wiring: Inspect the harness from the PCB to the motor for chafing, burns, or shorts to the cabinet. Repair any damaged wiring.
• 3. Motor test: Disconnect the motor and test its windings for continuity and insulation resistance. A shorted motor can cause the triac to fail.
• 4. PCB replacement: If the triac is visibly damaged or tests faulty, the entire control board is typically replaced as a unit. Use a genuine Zanussi board with the correct part number.
• 5. Professional repair recommended: Because this involves mains-level electronics and potential board-level faults, it is strongly recommended to use a qualified technician.