Stored fault recall Read the last stored fault code from the control

What the display is showing

The control remembers the latest fault codes even through power loss. Briefly disconnecting and reconnecting one main limit wire makes the status LED flash the last stored code, after which a component test starts. It does not work while a thermostat call or a blower off-delay is active.

Applies to: (F/G)9MXE and (F/G)9MXT furnaces

What to do

1. Leave 115 V power on. End any thermostat call and wait out blower delays.
2. Watch the status LED through the blower door.
3. Open the control door and, for a couple of seconds only, pull one main limit wire off and put it back.
4. The LED flashes the last stored code; read it against the service label.
5. A component test sequence follows. Refit the door.

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

• 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
• Component self-test Run all furnace components for a short test
• LED heartbeat Control OK - idle or running, no faults
• LED off Status LED dark - no power to the control or blown 3 A fuse
• LED steady ON Status LED on solid - control lockout (resets after 1 hour)