LG Oven F19 Error Code: Lower Oven Not Heating (Meaning, Causes, Fixes)

What the code means

LG USA's Range Error Codes List says F19 indicates an oven heating error, in the same list where F9 means the upper oven is not heating properly. LG's service manual for the LDG3015 double-oven gas range spells out the trigger: F-19 (No heating) sets if the current lower oven temperature does not exceed 150°F, or is lower than the start temperature, more than 5 minutes into preheating with the door closed. Proof, Warm and Broil are excluded. F-9 is the identical check for the upper oven. LG's manuals say F9 and F19 show on the display immediately, while some other F-codes are only stored in memory. Related lower-oven codes are F4 and F5 (lower oven sensor open or shorted), F16 (lower oven too hot) and F20 (lower oven door lock).

Likely causes

• A temporary control glitch that a reset clears, which is why LG's first steps are CLEAR/OFF and a 30-second breaker reset.
• Gas double-oven ranges: a weak or failed lower bake igniter. LG's service flowchart has the technician measure each igniter's resistance (about 45 to 400 ohms cold) and replace a failed one.
• Gas ranges: a bake gas (safety) valve that doesn't open; LG's flowchart checks its coil at about 1 to 1.5 ohms.
• Electric double-oven ranges: an open or shorted lower bake element, since LG's electric service manuals check heater resistance for F9 and F19.
• Loose or burned wiring between the relay board, igniters or elements and the oven system board (LG's first check in the F-9/F-19 flowchart).
• A lower oven temperature sensor reading wrong (LG's manual expects about 1.06 to 1.12 kilohms at 65 to 85°F).
• A failed relay board or oven system (main) board, which LG's flowchart replaces only after the igniters, valve, wiring and sensor test good.
• Gas supply off or low after the range was moved, or the door left open during preheat so the temperature never climbs.

Safe DIY checks

1. Press CLEAR/OFF (or turn the oven off), then start the lower oven again. LG says that is the first step for F19.
2. If F19 comes back, turn the range's circuit breaker off, wait 30 seconds, and turn it back on, as LG's error code list directs.
3. Keep the lower oven door closed during preheat. LG's F19 check runs only with the door closed, and an open door loses heat.
4. Gas range: if the range was recently pulled out, make sure the house gas shutoff and the range's pressure regulator are both open.
5. Gas range: start a lower bake and watch through the window or bottom vent. If the igniter never glows, or glows but the burner never lights, that points to the igniter or valve; turn the oven off and don't remove panels yourself.
6. Electric range: check that the breaker is fully on (a half-tripped double-pole breaker can keep the display lit with no heat). If the lower element looks blistered or split, stop using that oven.
7. If F19 still returns after the reset, note the model number and request service, as LG directs.

Parts that commonly fix it

Always match the part number to your exact model.

Related codes

• 5b (Sb) LG Oven 5b (Sb)
• F11 LG Oven F11
• F3 LG Oven F3
• F7 LG Oven F7
• F9 LG Oven F9

All LG codes →

Sources

1. LG USA Help Library: LG Range - Error Codes List (F19 oven heating error, F9 upper oven not heating properly; CLEAR/OFF, 30-second breaker reset, then service)
2. LG LDG3015 30" double-oven gas range service manual, Error Code Summary p. 9-1 (F-19 lower oven under 150°F or below start temperature after 5 minutes of preheat, door closed; F-9 upper oven)
3. LG LDG3015 service manual, Oven does not heat (including F-9, F-19) flowchart pp. 10-5 to 10-8 (wiring, igniters 45-400 ohms, gas valve 1-1.5 ohms, sensor, relay and oven system PCB)
4. LG LWD3063ST electric convection oven service manual, No Heating (including F9, F19) checks: wiring, heater resistance, sensor