Rheem R801SA furnace code 14: Unexpected flame
Safety issue — act now
What does code 14 mean on a Rheem R801SA (801S downflow) furnace display? Code 14 means the control sensed flame when none should be present. 14 and 10 can alternate, and the one-hour lockout timer starts only once the unexpected flame is no longer detected.
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 →
A qualified technician must find why flame is sensed out of sequence before the furnace runs again. Do not restart the furnace to see whether the code clears.
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 14 mean on a Rheem R801SA (801S downflow) furnace display?
Code 14 means the control sensed flame when none should be present. 14 and 10 can alternate, and the one-hour lockout timer starts only once the unexpected flame is no longer detected.
How do I fix Rheem R801SA furnace code 14?
If you smell gas or a CO alarm sounds, leave now without touching any switches or the thermostat, and call the gas utility or 911 from outside. Otherwise, set the thermostat to OFF, leave the furnace off and call for service. Do not restart it.
How much does it cost to fix Rheem R801SA furnace code 14?
Expect diagnostic time to trace why flame appeared out of sequence. Any part replacement or wiring correction is priced after the technician confirms the cause.
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.