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Goodman · Heat pump

08 No line voltage

High severity Goodman/Amana ComfortNet ASZC/GSZC/DSZC

What the control is telling you

The control sees line voltage below 185 VAC. The unit may look normal, or the compressor protector may be open with compressor and fan off. Clears once voltage rises above 185 VAC.

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

  • No or very low line voltage to the unit

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 disconnect.
  3. Verify the unit is fed with the voltage on the rating plate; measure at the contactor line side.
  4. Correct the supply problem or contact the utility.

Models that show this code

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

ASZC160241ASZC160361ASZC160421ASZC160481ASZC160601ASZC180241ASZC180361ASZC180481ASZC180601DSZC160241DSZC160361DSZC160481DSZC160601DSZC180361DSZC180481DSZC180601GSZC160241GSZC160361GSZC160481GSZC160601GSZC180241GSZC180361GSZC180481GSZC180601

Other codes on the same units

  • 04 Locked rotor
  • 05 Open circuit - compressor off over 4 hours
  • 06 Open start circuit
  • 07 Open run circuit
  • 09 Low 24 V control voltage
  • A2 Outdoor air temperature sensor fault
  • A3 Outdoor coil temperature sensor fault
  • b0 Indoor blower not running when it should be

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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.