LG · Dishwasher Serious
F35 — Heat-dry temperature sensing fault
On Dynamic Heat Dry models the temperatures of the heat-dry components cannot be measured. The fault usually points to the heat-dry heater, its thermistor, or harness.
- Keep using it?
- Limited use only
- DIY difficulty
- Hard
- Verified against
- lg.com ↗
How to fix it
- Power off at breaker and remove the inner door panel.
- Inspect the door-hinge harness — look for broken insulation or copper.
- Measure the heat-dry thermistor resistance per service-manual table.
- Measure the heat-dry heater for continuity; open = replace heater.
- Replace any failed component (thermistor, heater, or harness).
- If all door components test good, replace the main PCB.
- Reassemble and verify F35 does not return on next Heavy cycle.
Why it happens
Typical signs: F35 displayed during or after Dry phase · Dishes wet after cycle · Possible burning-plastic odor only if heater shorted · No audible heat-dry activation
- Failed heat-dry thermistor Temperature sensor in the dry circuit open or shorted.
- Failed heat-dry heater Heating element in the dry duct is open.
- Broken / pinched harness in door hinge Wires routed through the hinge fatigue and break.
- Main PCB sensor input damaged Sensor channel on board failed.
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.
More LG dishwasher codes
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.