What each York code means — and what to do next. Stuck? AAA Comfort Air fixes York systems across Central NJ, often same-day.
York (with sister brands Coleman and Luxaire, all part of Johnson Controls) builds reliable, good-value furnaces and ACs. Their boards flash colored LEDs.
The board flashes colored LEDs — green/amber for status, red for faults. Count the flashes of each color. The indicator is a colored LED flash (green/amber = status, red = fault).
| Code | What it means | What to do |
|---|---|---|
| Amber 4 | Restricted heating airflow | Replace a dirty filter |
| Amber 5 | Restricted vent / combustion air | Call us |
| Amber rapid | Flame sensor needs cleaning | Call us |
| Red 1 | Gas valve not powered | Call us |
| Red 2 | Pressure switch stuck closed | Call us |
| Red 3 | Pressure switch stuck open | Vent/condensate — call us |
| Red 4 | High-limit switch open (overheating) | Replace a dirty filter / clear airflow |
| Red 5 | Roll-out / auxiliary switch open (safety) | Shut off and call us immediately |
| Red 7 | Lockout (1 hr) after 3 failed ignition attempts | Flame sensor/igniter/gas — call us |
⚠️ Codes can vary by model and control-board revision — always confirm against the label inside your unit’s access panel. For any gas, electrical, or refrigerant fault, call a licensed technician.
The board flashes colored LEDs — green/amber for status, red for faults. Count the flashes of each color.
You can try one power cycle at the breaker to clear a one-time fault. But if the same code returns, it’s a real fault — repeatedly resetting a gas or electrical issue can be unsafe. Call AAA Comfort Air at 609-665-3022.
AAA Comfort Air installs and repairs York systems across Cream Ridge and Central New Jersey, with same-day and 24/7 emergency service. Call 609-665-3022.
Book online or call your local York HVAC team — same-day & 24/7 emergency service.
