Goodman Error Code Yellow 1 flash: Low side fault / low pressure trip / low pressure lockout (older ComfortNet board) (AC)
Goodman error code Yellow 1 flash on a air conditioner means: Low side fault / low pressure trip / low pressure lockout (older ComfortNet board). It is also called Goodman diagnostic code Yellow 1 flash.
Homeowner? What Goodman code Yellow 1 flash means for you
Call a technician Your air conditioner is reporting: Low side fault / low pressure trip / low pressure lockout (older ComfortNet board). The air conditioner has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.
Safe things you can check yourself
- Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
- Check both breakers and the outdoor disconnect box beside the outdoor unit; all should be ON.
- Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
- Keep about 2 feet around the outdoor unit clear of leaves, grass and debris.
- If you see ice on the pipes or the indoor coil, turn the system off and run only the fan for a few hours, then call a technician.
- Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Goodman error code Yellow 1 flash mean?
Yellow LED 1 flash. Green OFF + red OFF = low side fault (4 protector trips, average run over 3 h). Green ON + red OFF = low pressure switch opened. Green ON + red ON = low pressure lockout. Same meaning as 7-segment codes 01 / L1 on newer boards.
Applies to: Earlier ComfortNet condensers/heat pumps with the PCBHR101-103 or PBBGR101-102 outdoor control (green, yellow and red status LEDs) - ASXC/DSXC/ASZC/DSZC revisions before the PCBHR104 change
Common causes of Goodman code Yellow 1 flash
- Low refrigerant charge
- Restricted liquid line (drier, kinked line)
- Indoor blower motor failed or not running
A technician checks these and 1 other possible causes on site before replacing any part.
Goodman models that use code Yellow 1 flash
Show all 23 models
ASXC160241ASXC160361ASXC160481ASXC160601ASXC180241ASXC180361ASXC180481ASXC180601DSXC160241DSXC160361DSXC160481DSXC160601DSXC180361DSXC180481DSXC180601GSXC160241GSXC160361GSXC160481GSXC160601GSXC180241GSXC180361GSXC180481GSXC180601
Other Goodman AC codes
All Goodman Air Conditioner error codes →
Goodman code Yellow 1 flash: homeowner questions
What does Goodman code Yellow 1 flash mean?
Low side fault / low pressure trip / low pressure lockout (older ComfortNet board). Yellow LED 1 flash. Green OFF + red OFF = low side fault (4 protector trips, average run over 3 h). Green ON + red OFF = low pressure switch opened. Green ON + red ON = low pressure lockout. Same meaning as 7-segment codes 01 / L1 on…
Is it safe to keep using my air conditioner with code Yellow 1 flash?
It depends on the cause. The air conditioner has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.
Can I reset Goodman code Yellow 1 flash myself?
You can try one reset (power off for 30 seconds, then on). If Goodman code Yellow 1 flash comes back, the cause is still there and a licensed technician should check it.
Who can fix Goodman code Yellow 1 flash near me?
Aurora Star Tech Inc. repairs Goodman air conditioners in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: AC Running But Not Cooling: What to Check
Troubleshooting guides
- Not cooling All brands · Air Conditioner
- No cooling - R-32 GLXS/ALXS condenser Goodman · Air Conditioner
Source: Goodman ComfortNet ASXC/GSXC/DSXC, ASZC/GSZC/DSZC, AVPTC/MBVC service manual, diagnostic/status LED table (PCBHR101-103, PBBGR101-102) p.65-69. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.