HVAC, Appliance, CNC, and VFD Error Code Repair Guides

Browse repair guides for HVAC, appliances, refrigeration, CNC alarms, VFD faults, generators, boilers, water heaters, and commercial equipment.

• Allen-Bradley PowerFlex 70 Fault Codes - F2, F5, F7, F13, and F111

  Updated: 26 Sep, 2026

  PowerFlex 70 faults cover auxiliary input, power loss, overvoltage, motor overcurrent, ground fault, phase loss, and internal hardware trips.

• Allen-Bradley PowerFlex F004 Fault - DC Bus Undervoltage

  Updated: 26 Sep, 2026

  PowerFlex F004 means DC bus undervoltage. Check input voltage, phase loss, fuses, bus capacitors, weak supply, and line reactors.

• Bohn Refrigeration Error Codes - Temperature, Defrost, Sensor, and Fan Alarms

  Updated: 26 Sep, 2026

  Bohn unit-cooler alarms cover high box temperature, discharge temperature, suction pressure, defrost termination, fan motors, and sensors.

• Bradford White Infiniti K Tankless Water Heater Error Codes

  Updated: 26 Sep, 2026

  Bradford White Infiniti K tankless codes flag ignition, flame loss, combustion, condensate, scale, thermal fuse, and sensor faults.