Diagnosis
The Costway EP24744US utilizes a pair of infrared (IR) sensors—an emitter and a receiver—located within the ice chute to determine when the basket has reached capacity. When the ice pile reaches a specific height, it breaks the IR beam, triggering the "Full" indicator and pausing the cooling cycle. If the "Full" light is flashing while the basket is empty, it means the receiver is not detecting the signal from the emitter, leading the onboard logic to assume the beam is blocked by ice.
This failure is typically caused by one of three things: mineral scale buildup from hard water creating an opaque film over the sensor lenses, stray ice shards or frozen condensation clinging to the sensor housing, or a misalignment of the ice basket that prevents the sensors from having a clear line of sight. Because these sensors operate on a specific wavelength of light, even a thin layer of calcium carbonate or a single droplet of water on the lens can refract the beam, tricking the machine into a "full" state.
How to Fix It
- Disconnect the power cord from the wall outlet to prevent accidental activation of the cooling system while your hands are inside the chassis.
- Remove the ice basket entirely and set it aside. Use a flashlight to look upward into the ice chute (the area where the ice cubes drop from the freezing cylinders).
- Locate the two small, clear plastic protrusions on opposite walls of the chute. These are the IR emitter and receiver.
- Dip a cotton swab in a mixture of warm water and a tiny drop of white vinegar. Gently scrub the surface of both lenses to remove mineral deposits or "frost film."
- Dry the lenses thoroughly with a clean, dry cotton swab. Any remaining moisture can cause the beam to refract, potentially triggering the error again.
- Check the area around the sensors for any "stray" ice cubes or frozen slush that may have bridged the gap between the sensors. Use a plastic utensil to gently clear any debris.
- Slide the ice basket back into the unit, ensuring it is pushed firmly against the back wall. If the basket is slightly skewed, the sensors may not align correctly.
- Plug the unit back in and press the "Reset" or "Power" button to clear the error state.
If That Didn't Work
- Perform a Hard Power Cycle: Unplug the unit for at least 10 full minutes. This allows the internal capacitors to discharge and resets the control board's logic, which can sometimes clear a "ghost" full reading caused by a software glitch.
- Check for Internal Ice Blockage: Sometimes ice builds up inside the freezing cylinder housing above the chute. If a large chunk of ice is hanging from the dispenser, it may be blocking the sensor beam even if the basket below is empty. Use a hairdryer on a low, cool setting to melt any ice visible above the sensor line.
- Test with a Different Power Outlet: Voltage fluctuations can occasionally cause the IR sensors to malfunction or "flicker," triggering the full light. Plug the machine directly into a wall outlet rather than a surge protector or extension cord to ensure it is receiving a steady 120V supply.
- Inspect the Basket Seating: Check the bottom of the ice basket for any debris or frozen ice that might be preventing the basket from seating fully. If the basket is lifted even 1/4 inch, it can shift the internal alignment of the chute components.
Heads Up
- Avoid Harsh Chemicals: Never use bleach or abrasive scrubbers on the IR sensors; scratching the plastic lens will permanently diffuse the beam and cause the "Full" light to trigger permanently.
- Use Filtered Water: To prevent mineral buildup on the sensors, use distilled or filtered water. Hard water is the primary cause of sensor failure in the EP24744US model.
- Regular Descaling: Run a cleaning cycle with a 50/50 mixture of water and white vinegar once a month to keep the internal chute and sensors free of calcium deposits.
- Avoid Overfilling: Do not manually heap ice above the "Max" line in the basket, as this can force ice cubes into the sensor housing, potentially cracking the plastic lenses.