• Cleaning of fan
  • Faulty pressure sensors and temperature
  • Cleaning filters and variable air valves
  • Loose fittings noise or vibration
  • Faulty belts of fans
  • Dust and sand in motor bearings
  • Blocking of AC drain outlets
  • Faults in motors, timers, and relays
  • Faults in thermostat control
  • Blocked filters or dirty air diffusers