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Refrigerator compartment warms up while the freezer stays cold; often caused by the JAZZ board failing to initiate automatic defrost, leading to frozen evaporator coils blocking airflow.
Evaporator coils freeze solid and the unit never runs a defrost cycle; the JAZZ board acts as the defrost timer and controller — a failed board prevents defrost from running.
Control panel displays '---' instead of set temperatures, or the refrigerator randomly powers itself off and requires manual restart; indicates board logic failure.
Pressing temperature up/down buttons has no effect and setpoints cannot be changed on either the refrigerator or freezer zone; caused by a stuck key signal or failed control board.
Compressor and fan motors fail to start or run intermittently because the control board is not sending proper run signals to the compressor relay and fan motor circuits.
💡 Pro Tip: Is Your Control Board Really the Problem?
Your part is likely the culprit if you notice any of the following:
⚠️ Refrigerator stops cooling but the freezer remains cold — classic sign of a failed defrost control on the JAZZ board
⚠️ Temperature display reads dashes (---) or the unit randomly powers off and must be manually restarted
⚠️ Unable to adjust or set refrigerator or freezer temperature from the control panel
⚠️ Evaporator coils freeze solid while the fresh food section gets warm — defrost cycle not initiating
Before replacing the board, run the refrigerator's built-in forced defrost mode (hold Door Alarm + Freezer Temp DOWN for 3 seconds). If the coils clear during forced defrost but the unit won't auto-defrost, the JAZZ control board is the confirmed failure point. Always note your serial plate Program Code before disconnecting the old board — you'll need it to re-program the new one.
📦 What's in the Box
✅ 1× W10503278 / WPW10503278 Refrigerator JAZZ Electronic Control Board (with display sub-board pre-attached, anti-static packed)
✅ 1× Programming instruction sheet
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Disclaimer: Compatibility information, part numbers, and model fitment data on this page are sourced from manufacturer databases and third-party references. While we strive for accuracy, please verify your appliance model number before ordering. Heima is not responsible for errors or omissions in compatibility listings.
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