HVACopediaGoodman air conditioner error codes
52 codes with causes and test steps.
| Code | Meaning | Severity |
|---|---|---|
| 01 | Low side fault or low pressure switch trip | High |
| 02 | High side fault or high pressure switch trip | High |
| 03 | Short cycling | Medium |
| 04 | Locked rotor | Critical |
| 05 | Open circuit - compressor off over 4 hours | High |
| 06 | Open start circuit | Critical |
| 07 | Open run circuit | Critical |
| 08 | No line voltage | High |
| 09 | Low 24 V control voltage | Medium |
| b0 | Indoor blower not running when it should be | High |
| b9 | Indoor airflow lower than requested | Medium |
| d0 | No shared data on the network | High |
| d1 | Invalid shared data on the network | High |
| d2 | System mismatch - indoor unit cannot supply required airflow | Medium |
| d3 | Configuration mismatch - shared data does not match hardware | High |
| d4 | Shared data from the loader rejected | High |
| E5 | Outdoor control low-voltage fuse open | High |
| H8 | High line voltage | High |
| L1 | Lockout - low pressure switch tripped 3 times | High |
| L2 | Lockout - high pressure switch tripped 3 times | High |
| L6 | Lockout - open start circuit detected 4 times | Critical |
| L7 | Lockout - open run circuit detected 4 times | Critical |
| L8 | Low line voltage | High |
| P0 | Compressor protector open | High |
| Comfort Alert 1 | Yellow ALERT 1 flash - long run time | Medium |
| Comfort Alert 2 | Yellow ALERT 2 flashes - system pressure trip | High |
| Comfort Alert 3 | Yellow ALERT 3 flashes - short cycling | Medium |
| Comfort Alert 4 | Yellow ALERT 4 flashes - locked rotor | Critical |
| Comfort Alert 5 | Yellow ALERT 5 flashes - open circuit | High |
| Comfort Alert 6 | Yellow ALERT 6 flashes - open start circuit | Critical |
| Comfort Alert 7 | Yellow ALERT 7 flashes - open run circuit | Critical |
| Comfort Alert 9 | Yellow ALERT 9 flashes - low control voltage | Medium |
| Comfort Alert TRIP | Red TRIP LED - call present but compressor not running | High |
| Comfort Alert TRIP+ALERT | TRIP and ALERT LEDs flashing together - control voltage too low | Medium |
| CoreSense 1 | Yellow 1 flash - long run time (low side) | Medium |
| CoreSense 2 | Pressure trip - yellow 2 flashes (red 2 = lockout) | High |
| CoreSense 3 | Short cycling / pressure switch cycling - yellow 3 (red 3 = lockout) | Medium |
| CoreSense 4 | Locked rotor - yellow 4 (red 4 = lockout) | Critical |
| CoreSense 5 | Moderate run trip - yellow 5 (red 5 = lockout) | High |
| CoreSense 9 | Red 9 flashes - PROT output overcurrent | High |
| CoreSense solid red | Solid red TRIP - call present but compressor not running | High |
| EE | Outdoor control fault - compressor relay contacts welded | High |
| Yellow 1 flash | Low side fault / low pressure trip / low pressure lockout (older ComfortNet board) | High |
| Yellow 2 flashes | High side fault / high pressure trip / high pressure lockout (older ComfortNet board) | High |
| Yellow 3 flashes | Short cycling (older ComfortNet board) | Medium |
| Yellow 4 flashes | Locked rotor (older ComfortNet board) | Critical |
| Yellow 5 flashes | Open circuit (older ComfortNet board) | High |
| Yellow 6 flashes | Open start circuit / lockout (older ComfortNet board) | Critical |
| Yellow 7 flashes | Open run circuit / lockout (older ComfortNet board) | Critical |
| Yellow 8 flashes | Low or high line voltage (older ComfortNet board) | High |
| Yellow 9 flashes | Low 24 V control voltage (older ComfortNet board) | Medium |
| Yellow ON + Red ON | Compressor protector open (older ComfortNet board) | High |
Models covered
ALXS3BN**10AAALXS4BA**10AAALXS4NA**10AAALXS5BA**10AAANX130181ANX130241ANX130301ANX130361ANX130421ANX130481ANX130601ANX130611ANX140181ANX140191ANX140241ANX140251ANX140301ANX140361ANX140371ANX140421ANX140431ANX140481ANX140601ASX130181ASX130241ASX130301ASX130361ASX130421ASX130481ASX130601ASX130611ASX140181ASX140191ASX140241ASX140251ASX140301ASX140311ASX140361ASX140371ASX140421ASX140431ASX140481ASX140601ASX160181ASX160241ASX160301ASX160311ASX160361ASX160371ASX160421ASX160481ASX160601ASX160611ASX180**1ABASXC160241ASXC160361ASXC160481ASXC160601ASXC180241ASXC180361ASXC180481ASXC180601ASXH5***10DSX160241DSX160361DSXC160241DSXC160361DSXC160481DSXC160601DSXC180361DSXC180481DSXC180601GLXS3BN**10AAGLXS4BA**10AAGLXS4MA**10AAGLXS5BA**10AAGSX110903GSX110904GSX111203GSX111204GSX130181GSX130241GSX130301GSX130361GSX130363GSX130371GSX130421GSX130481GSX130483GSX130484GSX130601GSX130603GSX130604GSX130611GSX140181GSX140191GSX140241GSX140251GSX140301GSX140311GSX140361GSX140371GSX140421GSX140431GSX140481GSX140601GSX160181GSX160241GSX160301GSX160311GSX160361GSX160371GSX160421GSX160481GSX160601GSX160611GSX16A181GSX16A241GSX16A301GSX16A361
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.