Furnace attempts to start but shuts down quickly; LED flashes 5 times repeatedly.
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Possible Causes
How to Fix / Troubleshooting
Critical safety: Flame rollout or heat exchanger blockage can cause carbon monoxide. If you see scorch marks, melted wiring, or smell exhaust, shut off gas and power and call a licensed HVAC technician immediately.
- Inspect flame sensor wiring: With power off, check the flame sensor lead for damaged insulation or contact with metal surfaces. Repair or replace the wire if shorted.
- Clean flame sensor: Remove and gently clean the flame sensor rod with fine steel wool. Reinstall securely.
- Check for rollout signs: Look around the burner compartment for soot, discoloration, or tripped rollout switches. Do not bypass rollout switches; if tripped, have the furnace inspected.
- Reset rollout switches (if manual reset type): Some Amana models have manual-reset rollout switches with a small red button. If tripped, press to reset once only after confirming there is no visible damage or blockage.
Persistent 5-flash codes require professional diagnosis of the heat exchanger, venting, and combustion system.