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Goodman · Heat pump

05 Open circuit - compressor off over 4 hours

High severity Goodman/Amana ComfortNet ASZC/GSZC/DSZC

What the control is telling you

Compressor and outdoor fan have been off for more than 4 hours with both pressure switches closed - the control sees no compressor current.

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

  • Power disconnected (breaker, fuse, disconnect)
  • Compressor internal protector failed open
  • Compressor not wired correctly to the control

Test and repair steps

  1. Warning: Kill power to the outdoor unit before touching wiring, the compressor terminals or the control.
  2. Check breakers, fuses and the outdoor disconnect.
  3. Check wiring from the control and contactor to the compressor; repair or correct.
  4. Check compressor windings; a hot compressor may just be on its internal overload - let it cool and retest; replace if the protector stays open.
  5. Clears after one normal cycle or by power cycling the 24 VAC.

Models that show this code

24 models in Goodman/Amana ComfortNet ASZC/GSZC/DSZC

ASZC160241ASZC160361ASZC160421ASZC160481ASZC160601ASZC180241ASZC180361ASZC180481ASZC180601DSZC160241DSZC160361DSZC160481DSZC160601DSZC180361DSZC180481DSZC180601GSZC160241GSZC160361GSZC160481GSZC160601GSZC180241GSZC180361GSZC180481GSZC180601

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
  • 04 Locked rotor
  • 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.