Yellow 3 flashes Short cycling (older ComfortNet board)

What the control is telling you

Yellow LED 3 flashes, green and red off: the last 4 cycles each ran under 3 minutes without a protector trip. Same as code 03 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

• Intermittent thermostat call
• Faulty compressor relay on 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 thermostat and wiring for intermittent contact.
3. Check the compressor relay; replace the control if needed.
4. Clears after 4 normal cycles or 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 2 flashes High side fault / high pressure trip / high pressure lockout (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)