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Rheem 10: One-hour lockout, caused by repeated failed ignition (11), water sensed (59), dead blower (61), internal fault (93), flame lost 5 times (13) or unexpected flame (14)

Ref. RHEEM-10 · From the Rheem furnace manual · Updated 2026-10-23

Status code10Rheem
What it means

One-hour lockout, caused by repeated failed ignition (11), water sensed (59), dead blower (61), internal fault (93), flame lost 5 times (13) or unexpected flame (14).

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How it shows: Dual 7-segment display: 10 (alternates with the fault that caused it)

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§1Likely causes

  • See the code shown alternately with 10

§2Safe DIY steps

  1. Read the second code that alternates with 10 and follow that code
  2. Lockout clears when the cause is corrected and power is cycled off and on
Safety firstIf you smell gas, do not touch any electrical switch or use a phone in the building; leave immediately and call your gas supplier from outside. Turn off electrical power at the furnace switch or breaker before opening any panel, and never bypass or jumper a limit, rollout or pressure switch. Gas valve, burner, venting, wiring and control-board work should be done by a licensed HVAC technician.

§3When to call a pro

Call a licensed HVAC technician: if the furnace keeps entering lockout.

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§4Other Rheem codes

11Rheem

Failed ignition. After four failed attempts the control enters one-hour lockout (10).

12Rheem

Low flame sense: flame sense current is weak or marginal. Furnace keeps running.

13Rheem

Flame lost after established.

14Rheem

Flame present with gas valve off. Extremely critical; furnace will not operate.

30Rheem

Open fuse, usually from a 24 VAC short to common or ground.

33Rheem

Over-temperature (rollout) switch open: flames rolled out of the heat exchanger into the burner compartment.