KitchenAid Ice Maker Sensor Board Replacement – How to Diagnose & Replace the Sensor Board
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Understanding the Problem
What the sensor board does and why replacement fixes the problem: The ice maker sensor board (also called the ice maker control module or harvest/sensor PCB) monitors sensors, runs the ice make cycle and drives the harvest heater/solenoid and motor. When it fails the ice maker may not cycle, won't harvest, won't sense ice level, or shows error codes. Below are step-by-step diagnostics and replacement instructions. 1) Confirm the symptoms - Verify the ice maker symptoms (no ice produced, ice stuck in mold, ice maker not cycling, continuous water fill, ERR codes in display). Note the model number (usually on a sticker inside the fresh food compartment or freezer door jamb). 2) Basic checks before opening anything - Unplug the refrigerator or switch off the breaker to the unit. - Remove the ice bin and visually inspect the ice maker for ice jams, broken components, or obvious burn marks on the board. - Listen for motor activity during a manual cycle (if model supports a test cycle) and watch for any response when pressing the test switch. 3) Run simple electrical tests (multimeter required) - With power restored (use caution): check for line voltage to the ice maker harness (many boards run low voltage — consult your model schematic). Measure supply voltage at the harness connector to see if the board is receiving power. - Test outputs from the board during a test cycle: harvest heater output, motor output, fill valve output. If inputs are present and outputs are not, the board is likely bad. - Check continuity of the thermistor/temperature sensor and the door/optical/water level sensor if present. If sensors are good but the board does not respond, board is suspect. 4) Visual inspection of the board - Remove the ice maker cover and inspect the sensor board for cracked solder joints, burnt components, swollen capacitors or melted connectors. - If damage is obvious, replacement is recommended. 5) Replace the sensor/control board (general steps) - Tools: Philips screwdriver, nut driver set, needle-nose pliers, multimeter, replacement board (match model number). - Safety first: Unplug refrigerator or turn off breaker. - Remove ice bin and ice maker cover: locate and remove the screws securing the ice maker cover and module. - Disconnect the wiring harness: depress connector tabs and gently pull apart. Note connector orientation or take a photo for reference. - Remove mounting screws that secure the board or module to the ice maker housing. - Remove the old board/module and transfer any required brackets, clips, or sensors to the new board if applicable. - Install the new sensor board: position it, secure screws, and reconnect the wiring harnesses making sure connectors seat fully. - Reinstall the cover and ice bin. - Restore power and run a diagnostic/test cycle (consult your model’s service manual for exact test steps). Watch for proper fill, motor rotation, harvesting and that sensors register correctly. 6) Verify repair - Confirm the ice maker completes at least one full cycle (fill, freeze, harvest). Check for leaks and proper ice production over the next 24–48 hours. Safety note: Always disconnect power before removing covers or touching wiring. If you are not comfortable working around live circuits or repairing PCBs, stop and contact a qualified appliance technician. Using the wrong replacement board or incorrect wiring can cause further damage or create a fire risk.
Common Symptoms
Ice maker won't cycle or harvest, continuous running or constant fill, ice stuck in mold, no ice production, error codes related to ice maker or harvest cycle.
Common Causes
- Failed sensor/control board (burned components, failed output drivers)
- Bad thermistor or optical/tilt sensor feeding incorrect values to the board
- Connector/harness corrosion or intermittent power to the module
Popular Parts That Fix This Problem
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Helpful Repair Tip
Before replacing the board, run the ice maker test cycle and use a multimeter to confirm the board is getting supply voltage but not switching outputs — if inputs are present and outputs remain inactive, the board is very likely the fault.
Frequently Asked Questions
Can I repair the sensor board instead of replacing it?
Sometimes small board issues (cold solder joints, obvious broken traces, burnt connectors) can be repaired if you are skilled with soldering and electronics. However, modern boards use surface-mount components and epoxy — in most cases replacement is the reliable and safe fix. Always verify sensors and wiring first so you don't replace a board when the real fault is a bad sensor or loose connector.
How much does a replacement board cost and can I do this myself?
Cost varies by model — expect $40–$200 for a replacement board or $80–$300 for a full ice maker assembly. Difficulty is moderate: basic mechanical skills and a multimeter are required. If you can remove the ice maker cover, disconnect a few harnesses, and follow the steps above, you can do it yourself. If the board is integrated into molded assemblies or if you are uncomfortable working near electrical components, hire a technician.
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