Rheem R801SA furnace code 13: Flame lost
Professional repair
What does code 13 mean on a Rheem R801SA (801S downflow) furnace display? Code 13 means the burner lit and the flame was then lost. If this happens five times in one heat call, 10 and 13 alternate and the furnace locks out for one hour.
This condition involves the gas or combustion side. If you smell gas or a CO alarm sounds: leave, then call your gas utility. Diagnostic info here is reference — combustion repairs are for licensed technicians. All six emergency signs →
Safe checks before calling
Note how long heat runs before it shuts off and whether the blower keeps running afterward. Share that pattern with the technician.
A technician checks flame current through the full burn, then grounding, polarity and gas pressure, to find why an established flame drops out. These are live gas and electrical tests.
Possible causes
- Weak flame signal from sensor, grounding or polarity issues TECH
- Gas pressure problem that lets the flame drop out TECH
Parts for this code
No model-verified part number is listed here. Have the fault diagnosed and the correct part matched to your furnace before ordering.
Questions about this code
What does code 13 mean on a Rheem R801SA (801S downflow) furnace display?
Code 13 means the burner lit and the flame was then lost. If this happens five times in one heat call, 10 and 13 alternate and the furnace locks out for one hour.
How do I fix Rheem R801SA furnace code 13?
Book service and describe when heating stops: seconds after lighting or well into the cycle. The technician corrects the cause found by testing. Repeated restarts only add more failed cycles to the record.
How much does it cost to fix Rheem R801SA furnace code 13?
Diagnosis comes first, since flame loss has several electrical and gas causes. Labor and any parts depend on which one the technician confirms.
Applies to
R801SA / 801S downflow single-stage 80% furnace with PSC motor
Different Rheem generations use different code maps. If your series isn't listed, don't assume this meaning — check your blower-door label.
Verified against Installation Instructions for Downflow Single Stage Gas Furnaces, p.34
Verified against Rheem 801S Series Installation Instructions — OEM143-14 mirror, p.34
Verified against Rheem 801S Series Installation Instructions — OEM143-14 mirror, p.35
Last verified 2026-10-07 · page updated 2026-10-07 · how we verify
Related Rheem furnace codes
These codes use the same rheem 801s downflow single-stage control (manual 92-24161-143-14) system.