LED steady ON Status LED on solid - control lockout (resets after 1 hour)

What the control is telling you

A steady green light (no heartbeat, no flashing) means the board has locked itself out. It clears on its own after 1 hour.

Applies to: KeepRite (F/G)9MXE single-stage and (F/G)9MXT two-stage 95% furnaces

Likely causes

• Fault in the flame sensing circuit
• Gas valve relay stuck closed on the board
• Internal software check failure

Test and repair steps

1. Cycle power to the furnace to clear the lockout.
2. Watch a full heating cycle.
3. If the steady light comes back, replace the furnace control.

Settings for these units

• Filter size by casing width · KeepRite (F/G)96VTN Two-Stage Variable-Speed Furnace

Models that show this code

16 models in KeepRite (F/G)9MXE Single-Stage Furnace, KeepRite (F/G)9MXT Two-Stage Furnace

Other codes on the same units

• 5 Flame sensed with gas valve off
• 6 Flame not proved during ignition trial
• 6+1 Ignition lockout after 4 failed tries
• 7 Limit circuit lockout
• 8 Gas heating lockout - manual reset needed
• 9 High-heat pressure switch or relay did not close or reopened
• 10 Line voltage polarity reversed
• LED off Status LED dark - no power to the control or blown 3 A fuse