7 Limit circuit lockout

What the control is telling you

The limit or rollout switch stayed open more than 3 minutes. The control auto-resets after 3 hours.

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

Likely causes

• Same causes as code 4 (airflow, overfire, faulty limit)

Test and repair steps

1. Follow the code 4 checks.
2. Reset the rollout switch only after the cause is fixed.
3. Cycle power to clear the lockout and run a full heat cycle while checking temperature rise.

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

• 4 Limit or rollout circuit open
• 5 Flame sensed with gas valve off
• 6 Flame not proved during ignition trial
• 6+1 Ignition lockout after 4 failed tries
• 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