LG's LREL6325 troubleshooting begins with the simple causes of an oven that will not work: the plug is not fully in a live, grounded outlet, a fuse is blown or a breaker has tripped, the oven controls are set wrong, the oven is too hot to accept the mode (Self Clean locking temperature), a power outage, wiring incomplete after installation, or Sabbath mode is on (sb in the display and every function button dead). F-9 is the fault code LG lists for an oven that is not heating.
Differential
Likely causes of “LG range or oven oven will not heat or preheat”, and how to tell them apart
- 1
The breaker is tripped or a fuse is blown
What separates it The cooktop and oven display are both dead or the whole range shows nothing
How to confirm Reset the two-pole range breaker in the panel and check that the display returns
- 2
Sabbath mode is on
What separates it The display shows sb and no function button responds when you press it
How to confirm Press and hold Settings for three seconds until sb disappears
- 3
The oven control is set for a mode that cannot start
What separates it The display shows a temperature but the oven never heats after START
How to confirm Press CLEAR/OFF, choose Bake, key a temperature between 170 and 550 °F and press START
- 4
The bake element or sensor has failed
What separates it The controls work but the oven stays cool and F-9 shows
How to confirm Note the F-9 code, turn the oven off and contact LG or a service agent
Before you touch a setting
Record this first — changing settings destroys the evidence
- The exact code on the display, if any
- Whether the cooktop elements heat while the oven does not
- Whether the range display and clock are on
Try in this order
0 of 5 completedCheck power
ReversibleMake sure the range cord is fully seated in a live, grounded outlet and check the circuit breaker or fuse in your home; LG lists both as the first causes of a range that does not work.
Check Sabbath and lock
ReversibleIf sb appears, hold Settings for three seconds. If Loc or the lock icon shows, hold CLEAR/OFF for three seconds, because LG says Lock Out prevents most oven controls from starting.
Set the oven again
ReversiblePress Bake, key the temperature on the number keypad (for example 3, 7, 5), press START and watch the display count up from 100 °F in 5-degree steps.
Watch the preheat
ReversibleLG says the oven should reach set temperature in about 15 minutes with the convection fan running on this model during preheat.
Record any F code
ReversibleIf the display beeps and shows F-3 or F-9, turn the function off to clear it, reprogram, and call service with the code if it returns.
Model-specific
What is true of this model and not of its siblings
- EasyClean
- EasyClean loosens light soil with only water in a 10 minute low-temperature cycle: about 1 cup of water on the bottom and a quarter cup on the walls, with the oven below 150 °F, level, door shut and racks out. Distilled or filtered water avoids mineral marks, and Self Clean is still the option for heavy soil.
- Parts for this problem on the LREL6325 (RepairClinic, 2026-09-21)
- pcb assembly, main, part number EBR89295701, at $211.60.
- Other models this page answers
- These steps also fit the LSGL6335 gas range, LSIL6336 induction range, WCEP6423 combination wall oven, WSEP4723 wall oven.
Stop boundary
When this stops being a self-service repair
- !If F-9 returns after you clear the code and reprogram the oven, call LG service; this is the oven-not-heating fault code
- !If the breaker trips again as soon as it is reset, stop using the range and call an electrician
Evidence ledger
Sources behind this answer
LG's online owner's manual for this model: the Cooking, Parts and Features, Noises and Wi-Fi troubleshooting tables, Lock Out, Self Clean, Settings, InstaView, Warm Zone and LG ThinQ sections.
LG USA support page listing this model's manuals and warranty.
Parts and list prices as shown on RepairClinic's parts search for this model number on 2026-09-21.
Exact questions
Common questions
How long should preheat take?+
LG cites about 15 minutes for a test preheat.
What temperatures can Bake use?+
170 to 550 °F, with a default of 350 °F.
Does the oven need 240 volts?+
Yes, 120/240 V at 12.9 kW.
What if the whole range is dead?+
Check the breaker and the cord first.
Is clicking during heating normal?+
Yes, LG says elements click on and off.
Does Sabbath mode stop heating?+
It restricts Bake use and disables buttons.