What causes a ac not cooling?

A ac not cooling can be caused by cool, cold, refrigerant, compressor issues. We track 100 error codes across 3 brands related to this symptom.

How do I fix a ac not cooling?

There are 200 community-ranked fixes for this symptom across 3 brands. The average fix success rate is 89%. Find your specific error code below for step-by-step instructions.

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AC Not Cooling

Air conditioner running but not cooling? Find error codes for refrigerant leaks, compressor failure, frozen coils, and more.

100

Error Codes

Brands

200

DIY Fixes

89%

Avg Success

Mitsubishi

83 codes

All Mitsubishi codes

Installation Error Detected

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Test and Replace Faulty Wiring or Control Board Components

Centralized Controller Address Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Test and Reprogram M-NET Controller Addresses with Diagnostic Tool

Initial Startup Not Completed

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Perform Full System Commissioning Including Refrigerant Charge Verification

Forced Compressor Stop from Indoor Unit

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Check Refrigerant Pressure and Replace Indoor Coil Pressure Sensor

Pipe Temperature Sensor (TC3) Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Test and Replace Pipe Temperature Sensor (TC3)

Sub-Cool Pipe Temperature Sensor Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Test and Replace Sub-Cool Pipe Temperature Sensor (TC2)

Indoor Coil Freeze or Overheating Protection

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 85% success

Inspect and Clean Blower Wheel; Check Fan Motor Operation

Indoor Pipe/Coil Temperature Sensor Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 88% success

Test and Replace Indoor Coil Temperature Thermistor Sensor

Indoor Fan Motor Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Test Motor Windings and Replace Indoor Fan Motor

Indoor Unit EEPROM Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 90% success

Reflash or Replace Indoor Unit Control Board

Remote Controller Communication Error

❄️ SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit· 2 fixes· 85% success

Check and Repair Wired Remote Controller Cable Connections

Installation Error Detected

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Test and Replace Faulty Wiring or Control Board Components

Centralized Controller Address Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Test and Reprogram M-NET Controller Addresses with Diagnostic Tool

Initial Startup Not Completed

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Perform Full System Commissioning Including Refrigerant Charge Verification

Forced Compressor Stop from Indoor Unit

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Check Refrigerant Pressure and Replace Indoor Coil Pressure Sensor

Pipe Temperature Sensor (TC3) Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Test and Replace Pipe Temperature Sensor (TC3)

Sub-Cool Pipe Temperature Sensor Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Test and Replace Sub-Cool Pipe Temperature Sensor (TC2)

Indoor Coil Freeze or Overheating Protection

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 85% success

Inspect and Clean Blower Wheel; Check Fan Motor Operation

Indoor Pipe/Coil Temperature Sensor Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 88% success

Test and Replace Indoor Coil Temperature Thermistor Sensor

Indoor Fan Motor Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Test Motor Windings and Replace Indoor Fan Motor

Indoor Unit EEPROM Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 90% success

Reflash or Replace Indoor Unit Control Board

Remote Controller Communication Error

❄️ SVZ-KP18NA 18,000 BTU Multi-Position Ducted Air Handler· 2 fixes· 85% success

Check and Repair Wired Remote Controller Cable Connections

Installation Error Detected

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 90% success

Test and Replace Faulty Wiring or Control Board Components

Centralized Controller Address Error

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 90% success

Test and Reprogram M-NET Controller Addresses with Diagnostic Tool

Initial Startup Not Completed

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 90% success

Perform Full System Commissioning Including Refrigerant Charge Verification

Forced Compressor Stop from Indoor Unit

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 90% success

Check Refrigerant Pressure and Replace Indoor Coil Pressure Sensor

Pipe Temperature Sensor (TC3) Error

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 90% success

Test and Replace Pipe Temperature Sensor (TC3)

Sub-Cool Pipe Temperature Sensor Error

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 90% success

Test and Replace Sub-Cool Pipe Temperature Sensor (TC2)

Indoor Coil Freeze or Overheating Protection

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 85% success

Inspect and Clean Blower Wheel; Check Fan Motor Operation

Indoor Pipe/Coil Temperature Sensor Error

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 88% success

Test and Replace Indoor Coil Temperature Thermistor Sensor

Indoor Fan Motor Error

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 90% success

Test Motor Windings and Replace Indoor Fan Motor

Indoor Unit EEPROM Error

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 90% success

Reflash or Replace Indoor Unit Control Board

Remote Controller Communication Error

❄️ SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit· 2 fixes· 85% success

Check and Repair Wired Remote Controller Cable Connections

Centralized Controller Address Error