Don't discard your airfryer; understand why the E4 thermal sensor error happens and how to troubleshoot.
The E4 code indicates your NTC thermistor has failed, causing the PCB to shut down for safety.
Constant thermal cycling causes metal expansion and contraction, eventually stressing components beyond their operational limits.
The main control board detects impossible resistance values, signaling either an open circuit or a shorted sensor.
Service centers often replace entire assemblies because repairing a two-dollar component is labor-intensive and costly.
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