Rheem R801SA furnace code F: Continuous fan
Info — not a fault
What does F mean on a Rheem R801SA (801S downflow) furnace display? F means the continuous fan is on. The blower runs without a heating or cooling call, so register air will be close to room temperature.
Safe checks before calling
If you want the fan to run only during heating or cooling, set the thermostat fan to AUTO instead of ON.
Questions about this code
What does F mean on a Rheem R801SA (801S downflow) furnace display?
F means the continuous fan is on. The blower runs without a heating or cooling call, so register air will be close to room temperature.
Does Rheem R801SA furnace code F mean I need a repair?
F needs no repair. Room-temperature air during fan-only operation is expected. Book service only if F appears while the thermostat fan is set to AUTO and no schedule is calling for fan.
How much does it cost to fix Rheem R801SA furnace code F?
Continuous fan is a normal state and implies no repair bill on its own. A visit is only needed if the fan runs when the thermostat is not asking for it.
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 Rheem 801S Series Installation Instructions — OEM143-14 mirror, p.34
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.
| Pattern | Meaning |
|---|---|
| HSingle-character display: H | Gas heat on |
| CSingle-character display: C | Compressor running |
| 0Single-digit display: 0 | Standby |
| 93Two-digit display: 93 | Internal control fault |