How to Fix / Troubleshooting

Safety first: Leave the breaker off until the fault is identified. Only qualified persons should perform electrical testing.

Visual inspection: Open the electrical compartment and look for burned wires, melted insulation, or signs of arcing.
Isolate components: Disconnect the blower motor and igniter one at a time, then briefly reset the breaker to see if it still trips (do not allow heater to fully start during testing).
Check harness routing: Ensure wiring is not pinched under panels or rubbing against sharp metal edges.
Verify breaker sizing: Confirm the breaker and wire gauge match Thermeau’s installation requirements and that the heater is on a dedicated circuit.
Replace failed components: Replace any shorted motor, igniter, or damaged harness with genuine Thermeau parts.

Heater trips the electrical breaker when attempting to start.

Possible Causes