Rheem R801SA furnace code 10: One-hour lockout
Professional repair
What does code 10 mean on a Rheem R801SA (801S downflow) furnace display? Code 10 means the control has entered a one-hour soft lockout. Four failed ignitions, five flame losses in one heat call, unexpected flame or a dead-blower detection can cause it, and the reason code alternates with 10.
Before you touch anything: the six signs that mean stop troubleshooting and call a pro →
Safe checks before calling
Write down the full sequence, including the code shown with 10, and note whether ignition never starts or starts then stops. Leave panels in place.
A technician should identify which paired code caused the lockout, then test ignition, flame current, gas pressure, blower operation and safety circuits as that code directs.
Possible causes
- Repeated ignition failure or repeated flame loss during heating TECH
- Unexpected flame sensed when the burner should be off TECH
- Main limit open long enough to infer a dead blower 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 10 mean on a Rheem R801SA (801S downflow) furnace display?
Code 10 means the control has entered a one-hour soft lockout. Four failed ignitions, five flame losses in one heat call, unexpected flame or a dead-blower detection can cause it, and the reason code alternates with 10.
How do I fix Rheem R801SA furnace code 10?
Treat 10 as a pointer, not the fault itself. The repair follows the code shown alongside it. If that code is 14, keep the furnace off and call for service. Waiting out the hour or power cycling does not fix the underlying cause.
How much does it cost to fix Rheem R801SA furnace code 10?
Cost depends on the paired code, not the lockout. Diagnosis time covers reading that code and testing the related circuit; parts and labor follow only if a fault is confirmed.
Related symptoms
These symptoms can appear alongside this code. The link is an association, not a diagnosis, and code meanings vary by brand, model and control.
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.