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Goodman · Heat pump

CoreSense 4 Locked rotor - yellow 4 (red 4 = lockout)

Critical severity Goodman/Amana R-32 GLZS/ALZSGoodman/Amana R-410A GSZ/ASZ/DSZ (ANZ/SSZ/VSZ)

What the control is telling you

Compressor trips within 12 s of running and will not start within 35 s. Red 4 flashes = locked out after 10 locked-rotor events in a row.

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

  • Failed run capacitor
  • Low line voltage or poor connections
  • Liquid refrigerant in the compressor
  • Seized bearings

Test and repair steps

  1. Warning: Kill power to the outdoor unit before touching wiring, the compressor terminals or the control.
  2. Test the run capacitor and check wiring connections.
  3. Measure supply voltage at the disconnect during start.
  4. Check compressor oil level / flood-back.
  5. Replace the compressor if seized.

Models that show this code

122 models in Goodman/Amana R-32 GLZS/ALZS, Goodman/Amana R-410A GSZ/ASZ/DSZ (ANZ/SSZ/VSZ)

ALZS4BA**10AAALZS4NA**10AAALZS5BA**10AAANZ130181ANZ130241ANZ130301ANZ130361ANZ130421ANZ130481ANZ130601ANZ140181ANZ140241ANZ140301ANZ140361ANZ140421ANZ140481ANZ140491ANZ140601ASZ130181ASZ130241ASZ130301ASZ130361ASZ130421ASZ130481ASZ130601ASZ140181ASZ140241ASZ140301ASZ140361ASZ140381ASZ140421ASZ140481ASZ140491ASZ140601ASZ160181ASZ160241ASZ160301ASZ160361ASZ160421ASZ160481ASZ160601ASZ180361ASZ180481ASZ180601ASZH5***10DSZ160241DSZ160361DSZ160481DSZ160601DSZ180361DSZ180481DSZ180601GLZS4BA**10AAGLZS4MA**10AAGLZS5BA**10AAGSZ110903GSZ110904GSZ111203GSZ111204GSZ130181

Other codes on the same units

  • CoreSense 1 Yellow 1 flash - long run time (low side)
  • CoreSense 2 Pressure trip - yellow 2 flashes (red 2 = lockout)
  • CoreSense 3 Short cycling / pressure switch cycling - yellow 3 (red 3 = 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.