6+1 Ignition lockout after 4 failed tries

What the control is telling you

Six short and one long flash. Four ignition attempts failed to prove flame. The control resets itself after 3 hours.

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

Likely causes

• Any cause listed under code 6

Test and repair steps

1. Cycle 115 V or 24 V power to clear the lockout now.
2. Work through the code 6 checks gas supply, igniter, gas valve, flame sensor and ground.

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

• 3 Pressure switch did not close or reopened
• 4 Limit or rollout circuit open
• 5 Flame sensed with gas valve off
• 6 Flame not proved during ignition trial
• 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