Yellow 2 flashes High side fault / high pressure trip / high pressure lockout (older ComfortNet board)

What the control is telling you

Yellow LED 2 flashes. Green OFF = high side fault (4 protector trips, average run 1-15 min). Green ON + red OFF = high pressure switch opened. Green ON + red ON = high pressure lockout. Same meaning as 02 / L2 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

Likely causes

• Dirty or blocked outdoor coil
• Outdoor fan motor not running
• Outdoor fan wiring or capacitor failure

Test and repair steps

1. Warning: Kill power to the outdoor unit before touching wiring, the compressor terminals or the control.
2. Clean the outdoor coil and clear anything blocking air to or from the unit.
3. Check the outdoor fan motor runs; check its wiring and run capacitor and replace failed parts.
4. Test the high pressure switch (opens 610 +/- 10 psig, closes 420 +/- 25 psig).
5. High side fault clears after 4 normal cycles; lockout needs a 24 VAC power cycle.

Models that show this code

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

Other codes on the same units

• EE Outdoor control fault - compressor relay contacts welded
• Yellow 1 flash Low side fault / low pressure trip / low pressure lockout (older ComfortNet board)
• Yellow 3 flashes Short cycling (older ComfortNet board)
• Yellow 4 flashes Locked rotor (older ComfortNet board)
• Yellow 5 flashes Open circuit (older ComfortNet board)
• Yellow 6 flashes Open start circuit / lockout (older ComfortNet board)
• Yellow 7 flashes Open run circuit / lockout (older ComfortNet board)
• Yellow 8 flashes Low or high line voltage (older ComfortNet board)