Fujitsu · Air Conditioner error code

71Discharge thermistor error

Cross-checked High-voltage / caution

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Related diagnostic guides

Guide · Air Conditioner

PTAC not cooling (fan runs, air not cold)

Most PTAC no-cool calls are airflow (filter, coils), a wrong control setting or a failed compressor start component. Rule those out before suspecting the sealed system.

6 steps ~60 minmoderate

Guide · Air Conditioner

Air conditioner freezing up (ice on the coil)

Ice forms when the coil gets too cold, nearly always from low airflow or running in cool weather. Thaw first, then fix airflow. Repeated icing with good airflow suggests low charge, which is sealed-system work.

5 steps ~60 mineasy