Troubleshooting Frequent Heater Tripping

Usually overload, short, leakage or protector fault. Check supply voltage and that line/switch rating matches the load; test insulation with a megger for leakage from cracked/wet elements; verify thermostat, over-temp protector and sensor; inspect element short, internal sticking, dust short, or medium blockage/dry-fire. Repair and tidy lines.