Generic circuit_breaker Error Code Overloaded Circuit / Breaker Tripping Under Load

What does Overloaded Circuit / Breaker Tripping Under Load mean?

Circuit is drawing more current than the breaker's rated capacity, causing thermal overload trip.

Common causes

• Too many devices on single circuit
• High-draw appliance on wrong circuit
• Undersized circuit for application
• Failing appliance drawing excessive current
• Loose connections causing resistance heating

Diagnostic & testing steps

1. 1. Calculate total load: add wattages of all devices, divide by voltage (120V)
2. 2. 15A circuit maximum: 1440W continuous (80% NEC rule)
3. 3. 20A circuit maximum: 1920W continuous
4. 4. Measure actual current with clamp meter - compare to nameplate
5. 5. Test breaker: thermal trip should occur within NEC time-current curve
6. 6. If breaker trips at rated load, it may be weak/worn - test with a new breaker
7. 7. Check terminal connections for signs of heating (discoloration, melting)

Tools required

• Clamp meter
• Multimeter
• Non-contact thermometer

OEM parts & part numbers

Circuit Breaker, Wire Connector

Part numbers: HOM115CP, QO115CP

Safety warning

⚠️ FIRE & SHOCK HAZARD: Work inside panel with extreme caution. Main breaker must be OFF. Arcing from loose connections at high current can cause fire. Never upsize a breaker as a fix for overload.