“F4” fault code appears; Gladiator freezer may overheat or not defrost correctly.

Safety First: Disconnect power before inspecting wiring. Avoid contact with sharp metal edges.

• Step 1 – Inspect harness routing: Look for areas where the sensor harness may be pinched between panels or rubbing on metal.
• Step 2 – Resistance test: Disconnect the thermistor and measure resistance. A near-zero reading indicates a shorted sensor; replace it.
• Step 3 – Check for moisture: Dry any wet connectors and apply dielectric grease if recommended.
• Step 4 – Replace control board: If a new sensor and good wiring still result in F4, the electronic control board may be defective.