Goodman Furnace 5 flashes: Flame sensed with no call for heat

The control senses flame when the gas valve is off and runs both blowers continuously with no further furnace operation. The manual lists a short to ground in the flame sense circuit, miswiring, a lingering flame or a slow closing gas valve.

Is it safe to keep running? No. Turn it off and get it checked. Turn the thermostat to Off and call a licensed technician. If you smell gas, leave the house and call your gas utility from outside.

🛑 Stop and call a licensed pro if

• Turn the thermostat to Off and call a licensed technician. If you smell gas, leave the house and call your gas utility from outside.
• You smell gas. Leave the house, do not touch switches, and call your gas utility from outside.
• Flame rollout, limit or pressure switch codes that come back after one reset.
• Anything involving the control board, gas valve, flame sensor, igniter or venting.
• A carbon monoxide alarm sounds. Get everyone outside and call 911 or the fire department.

Safe first steps for any Goodman code

1. Count the LED flashes through the blower door window before you switch anything off. Cutting power can clear the code.
2. Replace or clean the furnace air filter.
3. Check the thermostat: correct mode, set above room temperature, and fresh batteries.
4. Make sure the furnace power switch and breaker are on. If the furnace has locked out, turning the power off and back on once restarts it.
5. Make sure the gas valve is in the ON position, following the lighting instructions on the furnace label only.
6. On high-efficiency furnaces, look at the outside vent and intake pipes for snow, ice, leaves or nests (look only, do not take pipes apart).

Shaun Cain · Certified HVAC & Refrigeration Technician · Ask an HVAC technician