LG · Oven Moderate

CF2 — Left-rear cooktop sensor open/short

Companion to CF1 for the Left Rear surface element. Sensor circuit is open or shorted; that zone is disabled.

Keep using it?
Yes, with caution
DIY difficulty
Moderate
Verified against
lg.com ↗

How to fix it

  1. Power down at the breaker.
  2. Lift the cooktop to access the LR sensor.
  3. Measure sensor resistance (~1090 Ω room temp); replace if open or shorted.
  4. Trace the harness for damage; replace pigtail if needed.
  5. Reseat the connector at the cooktop board.
  6. Replace the cooktop control board if everything else checks good.

Why it happens

Typical signs: CF2 on display · Left rear burner cold or runs uncontrolled · Other zones unaffected

  • Failed LR zone thermistor Sensor open or shorted.
  • Damaged harness under cooktop Heat or pinch damage.
  • Loose cooktop board connector Plug worked loose.
  • Cooktop control board fault Bad sensor input on PCB.

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

  • LG cooktop surface sensor Common replacement
    Amazon →

More LG oven codes

5b 5b — Sabbath Mode active (not a fault) CF1 CF1 — Left-front cooktop sensor open/short CF3 CF3 — Right-front cooktop sensor open/short CF4 CF4 — Rear Cooktop Sensor Error (Zone Varies by Model) F1 Range F1 — Upper Oven Thermistor Error F10 Range F10 — Door Locking System Failure

All LG codes → All oven codes →

Frequently asked questions

What does the CF2 code mean on a LG oven?

Companion to CF1 for the Left Rear surface element. Sensor circuit is open or shorted; that zone is disabled.

What causes the CF2 code on a LG oven?

Failed LR zone thermistor: Sensor open or shorted. Damaged harness under cooktop: Heat or pinch damage. Loose cooktop board connector: Plug worked loose.

Is it safe to keep using a LG oven with a CF2 error?

Yes, with caution. This is rated a moderate-severity fault.

How do I fix CF2 on a LG oven?

Power down at the breaker. Lift the cooktop to access the LR sensor. Measure sensor resistance (~1090 Ω room temp); replace if open or shorted.

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: lg.com.