Furnace Error Codes & Flashing Lights — What to Do Next
Error codes are a symptom. If you have no heat or repeated lockouts, call a licensed technician.
Call 778-909-5731Important Safety Note
Don't attempt repairs yourself on gas or electrical components. Error codes indicate a problem that requires professional diagnosis. If you smell gas, leave immediately and contact your utility company or emergency services.
Error Code Resources by Brand
Lennox Error Codes
Common Lennox furnace error codes and what they mean
Goodman Error Codes
Goodman furnace error codes and troubleshooting
Payne Error Codes
Payne furnace error codes reference
Flashing Red Light
What flashing red lights typically indicate
Common Error Symptoms
Pressure Switch Issues
Stuck open or closed
Often indicates venting problems, condensate drain issues, or faulty pressure switch.
Learn MoreIgnition Lockout
Won't ignite after multiple attempts
Safety lockout after failed ignition attempts. Requires professional diagnosis.
Learn MoreWhat You Can Check Safely
- •Thermostat is set to heat and above room temperature
- •Furnace power switch is on
- •Circuit breakers are not tripped
- •Air filter is not severely clogged
If these don't resolve the issue, call for professional service.
When to Call Now
If your furnace won't start, repeatedly locks out, or you have no heat, don't delay.