Unit trips household circuit breaker or blows fuse when starting to heat

Safety first: Unplug immediately. Do not repeatedly reset breakers without finding the cause.

• Visual inspection: Remove the bottom cover and look for burned wires, melted insulation, or scorch marks near the heater and power input.
• Check heater resistance (skilled users): Use a multimeter to measure resistance of the heating element; a very low reading may indicate a short.
• Inspect wiring routing: Ensure no wires are pinched between metal parts or touching sharp edges.
• Dry moisture: If there are signs of water ingress, dry the interior thoroughly before retesting.

If the breaker still trips after addressing visible issues, the main PCB or heater may be internally shorted and should be replaced by a qualified technician.