Why does my furnace turn on then off after a few minutes?
A defective pressure switch is another key reason why your furnace turns on then off after a few minutes. The pressure switch should close with airflow from the draft inducer motor through the burner to indicate that ignition is safe.
What to do when your furnace goes into lockout?
After 3 times the furnace goes into lockout, and the only way to get it out of lockout is to turn the power switch off and on. Everything starts over again without ignition of your gas burners. Solution: First, turn off the power to your furnace.
What should I do if my furnace flame sensor goes out?
Clean your flame sensor with steel wool or emery cloth (fine sand paper). You might need a new flame sensor, but most of the time they can be cleaned and your furnace will work well after cleaning. I have seen the flame sensor go out. Most of the time when they go out the white porcelain is cracked.
What happens when the main burner on a furnace ignites?
Problem: Your furnace main burner ignites, the main burner stays on for 8 to 10 seconds, then shuts right back off. Your furnace tries this ignition sequence again, and the same thing happens.
A defective pressure switch is another key reason why your furnace turns on then off after a few minutes. The pressure switch should close with airflow from the draft inducer motor through the burner to indicate that ignition is safe.
How can I tell if my furnace flame rollout switch is defective?
When this happens, the furnace will shut off after running for a few minutes. To determine if the flame rollout switch is defective, use a multimeter to test it for continuity.
Why is the flame sensor on my furnace not working?
If dirt or dust covers the sensor, the flame isn’t detected, and the furnace shuts down. Sometimes all that is needed is a simple cleaning of the flame sensor, but it may also be worn out and need to be replaced. This switch keeps track of how hot the burners are.
What causes a Rheem furnace to shut off after a few minutes?
If the draft inducer motor is defective, it may be unable to close the pressure switch, causing the ignition process to stall and the furnace to shut off after a few minutes. If the ignition process stalls, the furnace will shut off. If the draft inducer motor is at fault, replace it.
