Equipment guide
Air Conditioner error codes
Codes are manufacturer-specific. Choose the exact brand shown on your equipment.
Official Frigidaire material describes AS as Room temperature thermistor failed Please try resetting the unit by unplugging it from the power source for up to 30 seconds, then plug it back in. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Frigidaire lists EC for Room air conditioners and describes it as: Communications error. Confirm the complete model number before applying this device-family guidance.
Official Frigidaire material describes ES as Indoor defrost thermistor failure or Humidity sensor failure Please try resetting the unit by unplugging it from the power source for up to 30 seconds, then plug it back in. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Official Frigidaire material describes F1 as Freeze protection engaged Please try resetting the unit by unplugging it from the power source for up to 30 seconds, then plug it back in. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Official Frigidaire material describes F2 as Freeze protection Allow the unit to defrost for 5 minutes, if the error code returns after resetting the unit, please contact us for additional support. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Official Frigidaire material describes HS as Air discharge thermistor failed Please try resetting the unit by unplugging it from the power source for up to 30 seconds, then plug it back in. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Frigidaire lists LC for Room air conditioners and describes it as: Communication error between indoor/outdoor units. Confirm the complete model number before applying this device-family guidance.
Official Frigidaire material describes P1 as This indicates the bottom tray is full Carefully move the unit to a drain location, remove the bottom drain plug and let the water drain away. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
The official NAA Air Conditioner Installation and Operation Manual identifies ATL as overtemperature protection. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies d0 as running indication during oil-return mode. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies dC as running indication during forced-cooling mode. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies F0 as communication failure (outdoor unit). This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies F1 as low pressure switch error. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies F4 as t4 outdoor ambient temperature sensor error. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies F5 as t5 compressor discharge temperature sensor error. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies F6 as t3 condensing temperature sensor error. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies F7 as t7 temperature sensor error. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies F8 as t7 temperature sensor error in detecting condensate risks. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies F9 as ac overvoltage or undervoltage protection. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies FA as outdoor-unit eeprom failure. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies FB as driver-chip eeprom failure. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies FC as ipm module sensor error. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies FD as hlp pressure sensor failure. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies FE as t3 or t5 sensor disconnected. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies FF as hps condenser sensor disconnected. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies H0 as communication fault between the master board and driver chip. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies H1 as t3 sensor high temperature error after three p5 events within 180 minutes. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies H2 as high pressure switch error after three p1 events within 150 minutes. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies H4 as ipm module high temperature error after three p8 events within 120 minutes. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies H5 as low pressure error after five p2 events within 240 minutes. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies H6 as abnormal discharge temperature after three p4 events within 100 minutes. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies H7 as moisture exposure operation error after three pc events within 200 minutes. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies H8 as t3 condenser sensor disconnection after three fe events within 120 minutes. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies HC as discharge temperature sensor disconnection after three fe events within 180 minutes. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies HE as condensate error after three events within 60 minutes. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies L0 as low dc bus voltage protection. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies L1 as high dc bus voltage protection. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies LA as frequency limited by voltage. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies LB as frequency limited or reduced by high pressure. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies LC as frequency limited by condenser temperature. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies LD as frequency limited by discharge temperature. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies LE as frequency limited by high ipm module temperature. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies LF as frequency limited by current. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies P1 as high pressure switch error. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies P2 as low pressure protection. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies P3 as inverter overcurrent protection. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies P4 as high compressor discharge temperature protection at the t5 sensor. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies P5 as high condenser temperature protection at the t3 sensor. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies P6 as ipm protection. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies P8 as ipm high temperature protection (ft). This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies P9 as dc fan motor error. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies PC as wet operation error. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.
The official NAA Air Conditioner Installation and Operation Manual identifies PRH as crankcase heater in progress; start-up is inhibited. This meaning is limited to the documented NAA Series R-454B unitary small air conditioner.