HVACopedia

Goodman · Heat pump

06 Open start circuit

Critical severity Goodman/Amana ComfortNet ASZC/GSZC/DSZC

What the control is telling you

Compressor and outdoor fan are off; pressure switches closed. The control sees current only in the run winding - the start circuit is open.

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

  • Compressor start winding open
  • Failed run capacitor or capacitor wiring
  • Compressor not wired correctly to the control
  • Faulty compressor wiring

Test and repair steps

  1. Warning: Kill power to the outdoor unit before touching wiring, the compressor terminals or the control.
  2. Check the run capacitor and its wiring; replace if weak or open.
  3. Measure compressor winding resistance (C-S, C-R, R-S); an open start winding means compressor replacement.
  4. Check compressor wiring and connections at the control and terminals.
  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

  • 02 High side fault or high pressure switch trip
  • 03 Short cycling
  • 04 Locked rotor
  • 05 Open circuit - compressor off over 4 hours
  • 07 Open run circuit
  • 08 No line voltage
  • 09 Low 24 V control voltage
  • A2 Outdoor air temperature sensor fault

Save it for the next call

Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.

Open the app

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.