Failure Codes - LG LRE30453SW Service Manual

WARNING
!
• DISCONNET 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 severe personal
injury, 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)

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 sensor, heater (bake, broil) and Control(PCB)
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
Control(PCB)
F9 Oven is A. Perform step 1 through 2 above
too hot; B. Open the back panel and Disconnect
Bad oven sensor from harness
- Measure Ω value between connector pins
sensor;
Bad
control
(PCB) => if there is any problem, Replace oven sensor
C. Check the bake and broil relay (refer to the strip
circuit section) STRIP CIRCUITS
D. If there is any problem, Replace Control (PCB)
7-0
CORRECTIVE ACTION
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
:approximately 1090 Ω (at room temperature
:77F/25°C)