Rheem R801SA furnace code H: Gas heat on
Info — not a fault
What does H mean on a Rheem R801SA (801S downflow) furnace display? H means the control is running a gas heating call. It shows the operating mode only and does not by itself confirm that the burner lit or warm air is reaching the rooms.
Safe checks before calling
If H shows but rooms stay cold, check the accessible filter, confirm registers are open, and note whether register air warms once the burner has had time to start.
Questions about this code
What does H mean on a Rheem R801SA (801S downflow) furnace display?
H means the control is running a gas heating call. It shows the operating mode only and does not by itself confirm that the burner lit or warm air is reaching the rooms.
Does Rheem R801SA furnace code H mean I need a repair?
H alone needs no repair. If H stays on while only cool air arrives or heat stops early, record what you observe and any code that appears, then book service.
How much does it cost to fix Rheem R801SA furnace code H?
H is a normal operating display, so it implies no repair bill. Cost arises only if a separate heating problem is diagnosed.
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 |
|---|---|
| CSingle-character display: C | Compressor running |
| FSingle-character display: F | Continuous fan |
| 0Single-digit display: 0 | Standby |
| 93Two-digit display: 93 | Internal control fault |