Rheem · Furnace / HVAC
E1 Ignition failure
What this code means
Rheem gas furnaces (including the RGRK/RGRL/R95 lines) display E1 when the burners fail to light within the allowed attempts.
Most likely causes
- Flame sensor coated with carbon buildup
- Gas supply valve partially closed
- Igniter not glowing / open circuit
What to try first
Locate the flame sensor rod near the burners, remove it, and clean it gently with fine sandpaper or steel wool before reinstalling.
Good news: this one is often fixable without a service call. If it persists after the steps above, have it looked at.
Find the part on Amazon →FAQ
What does Rheem error code E1 mean?
Ignition failure. Rheem gas furnaces (including the RGRK/RGRL/R95 lines) display E1 when the burners fail to light within the allowed attempts.
Can I fix Rheem code E1 myself?
Often, yes. Locate the flame sensor rod near the burners, remove it, and clean it gently with fine sandpaper or steel wool before reinstalling.
What causes Rheem code E1?
The most common causes are: flame sensor coated with carbon buildup; gas supply valve partially closed; igniter not glowing / open circuit.
Other Rheem furnace codes
All Rheem furnace error codes →
Other furnace brands: Trane · Carrier · Lennox · Goodman · Amana · American Standard · Bryant · Generic · Nest
This information may contain errors or not apply to your exact model — always double-check it against your appliance's own manual before acting. If there's any chance of a gas, fire, electrical, carbon monoxide, or other safety hazard, stop and call a licensed professional or the appropriate agency (e.g. your gas utility) instead of relying on this page alone.