Failure Codes - LG LRE30451 Service

!
WARNING
• Disconnect power supply cord from the outlet
before servicing
• Replace all panels and parts before operating.
• Reconnect all grounding devices
Failure to do so can result in death or electrical
shock
"F" (Failure) DISPLAY CODES
Before doing any action, perform the following step1~3.
Step1. Unplug range or disconnect power.
Step2. Check if connector is fully seated or not.
Note: All units in the first few days of use should be
checked for mis-wiring or loose connections.
DISPLAY CAUSE
SHOWS
F1 Key held A. Perform step 1 through 2 above
down too B. Replace keypad or keypad assembly
long or (if F code recur, go to C after unplugging
shorted or disconnecting)
key C. Replace Control (PCB) assembly
F2 Door A. Perform step 1 through 2 above
Locking B. Check wire and connections from control to latch
system C. If motor operate, check integrity of latch mechanism
don't - check the micro-switch (refer to
operate component test section)
- check integrity of door locking mechanism
D. If motor didn't operate, check continuity of
the latch motor and electrical connections
- if the wiring is bad, replace the harness
- if the wiring is good, replace the door
motor assembly
- if F code recur, replace control
F3 Main oven A. Perform step 1 through 2 above
Sensor B. Open the back panel and check continuity of
opened the sensor and Control (PCB)
C. Disconnect sensor from harness
F4 Main oven
D. - Measure Ω value between connector pins :
Sensor
Approximately 1090 Ω (at room temperature:
shorted
77F/25°C)
- Measure value between sensor chassis
and any connector pins
: Ω value should read OPEN
=> if there is any problem, Replace oven sensor
E. If you couldn't find any problem, Replace
Control (PCB)
F5 Warming A. Perform step 1 through 2 above
drawer B. Open the back panel and check continuity
Sensor of the sensor and Control (PCB)
shorted C. Disconnect sensor from harness
D.- Measure Ω value between connector pins
F6 Warming
:Approximately 50kΩ (at room temperature
drawer
77F/25°C)
Sensor
- Measure value between sensor chassis
open
and any connector pins
: Ω value should read OPEN
=> if there is any problem, Replace
warming drawer sensor
E. If you couldn't find any problem, Replace
Control(PCB)

FAILURE CODES

CORRECTIVE ACTION
DISPLAY CAUSE
SHOWS
F7 Main oven A. Perform step 1 through 2 above
heating B. Open the back panel and check continuity of the
error
C. Check the bake and broil heater(refer to
D. Disconnect sensor from harness
=> if there is any problem, Replace oven sensor
E. If you couldn't find any problem, Replace
F9 Oven is A. Perform step 1 through 2 above
too hot; B. Open the back panel and Disconnect
Bad oven
sensor;
Bad
control
(PCB)
=> if there is any problem, Replace oven sensor
C. Check the bake and broil relay (refer to the strip
D. If there is any problem, Replace Control (PCB)
7-0
CORRECTIVE ACTION
sensor, heater (bake, broil) and Control(PCB)
component test)
- Measure Ω value between connector
pins of oven sensor
- Measure Ω value between sensor
chassis and any connector pins
: Ω value should read OPEN
Control(PCB)
sensor from harness
- Measure Ω value between connector pins
:approximately 1090 Ω (at room temperature
:77F/25°C)
circuit section) STRIP CIRCUITS