HVACopediaGoodman · Heat pump
CoreSense 2 Pressure trip - yellow 2 flashes (red 2 = lockout)
What the control is telling you
Compressor ran 12 s to 15 min, then tripped for longer than 7 min (discharge pressure too high or overload). Red 2 flashes with yellow off = locked out after 4 trips in a row or 10 total.
Applies to: Copeland CoreSense 3-wire module: Amana/Deluxe R-410A ASX, ASZ, DSX, DSZ units and Amana R-32 ALXS / ALZS units
Likely causes
- Outdoor fan not running (capacitor, wiring, motor)
- High head pressure: high pressure switch, overcharge, non-condensables
- Dirty, blocked or damaged outdoor coil
Test and repair steps
- Warning: Kill power to the outdoor unit before touching wiring, the compressor terminals or the control.
- Check outdoor fan capacitor, wiring and motor.
- Clean the outdoor coil.
- Check charge for overcharge and for non-condensables; check the high pressure switch.
- After the repair, reset the module lockout (cycle power / reset button) and verify.
Models that show this code
122 models in Goodman/Amana R-32 GLZS/ALZS, Goodman/Amana R-410A GSZ/ASZ/DSZ (ANZ/SSZ/VSZ)
Other codes on the same units
- CoreSense 1 Yellow 1 flash - long run time (low side)
- CoreSense 3 Short cycling / pressure switch cycling - yellow 3 (red 3 = lockout)
- CoreSense 4 Locked rotor - yellow 4 (red 4 = lockout)
- CoreSense 5 Moderate run trip - yellow 5 (red 5 = lockout)
- CoreSense 9 Red 9 flashes - PROT output overcurrent
- CoreSense solid red Solid red TRIP - call present but compressor not running
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Source: Goodman RS6200301 R-32 GLXS/ALXS/GLZS/ALZS service (07-2024), CoreSense Diagnostics Table p.21-22 and Quick Reference Table p.23; Goodman RS6200006r103 R-410A ASX/GSX/DSX/ASZ/GSZ/DSZ service (text export) (Goodman_R_410A_ASX_GSX_DSX_A_C_and_ASZ_GSZ_DSZ_HP_covers_GSX_GSZ_lines_GSXH5_GSZH5_service.txt section Diagnostics Table: Coresense Module / Table 1 Quick Reference). Summarized in our own words; check the original manual for your model.
Homeowner looking at this code? See what it means for you and when to call a technician.
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.