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Goodman · Air conditioner

04 Locked rotor

Critical severity Goodman/Amana ComfortNet ASXC/GSXC/DSXC

What the control is telling you

The compressor protector tripped 4 times in a row with an average run time under 15 seconds. Compressor and outdoor fan are off.

Applies to: Communicating 2-stage condensers and heat pumps with the PCBHR104 or PCBHR105 outdoor control (7-segment display): ASXC16/18, GSXC16/18, DSXC16/18, ASZC16/18, GSZC16/18, DSZC16/18

Likely causes

  • Seized compressor bearings
  • Failed run capacitor or bad capacitor wiring
  • Low line voltage

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 (capacitance under load or with a meter) and its wiring; replace as needed.
  3. Measure line voltage while the compressor tries to start; it must stay within the rating plate range - contact the utility if supply is low.
  4. Check compressor windings and try a start; replace the compressor if it is mechanically locked.
  5. To reset a lockout, interrupt the 24 VAC supply to the outdoor control (power cycle the low voltage), then retest.

Models that show this code

23 models in Goodman/Amana ComfortNet ASXC/GSXC/DSXC

ASXC160241ASXC160361ASXC160481ASXC160601ASXC180241ASXC180361ASXC180481ASXC180601DSXC160241DSXC160361DSXC160481DSXC160601DSXC180361DSXC180481DSXC180601GSXC160241GSXC160361GSXC160481GSXC160601GSXC180241GSXC180361GSXC180481GSXC180601

Other codes on the same units

  • 01 Low side fault or low pressure switch trip
  • 02 High side fault or high pressure switch trip
  • 03 Short cycling
  • 05 Open circuit - compressor off over 4 hours
  • 06 Open start circuit
  • 07 Open run circuit
  • 08 No line voltage
  • 09 Low 24 V control voltage

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Source: Goodman ComfortNet ASXC/GSXC/DSXC, ASZC/GSZC/DSZC, AVPTC/MBVC service manual, Unitary Diagnostic Codes PCBHR104 p.71-77 and PCBHR105 p.78-84. 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.