Dryer occasionally trips the household circuit breaker or RCD during operation

Safety first: Unplug the dryer and do not repeatedly reset the breaker without finding the cause. Risk of fire or electric shock.

• Inspect mains cable and plug: Look for damage, cuts, or burn marks. Replace if any defects are found.
• Check for moisture: Inspect internal wiring and connectors for signs of water ingress, especially around the pump and condenser areas. Dry thoroughly and fix any leaks.
• Test heater to earth (with multimeter): With the dryer unplugged, measure resistance between each heater terminal and the metal chassis. Any low resistance indicates a leakage path; replace the heater.
• Professional insulation testing: If the cause is not obvious, a technician should perform insulation resistance tests on the motor and wiring.