featured Diesel Heater E06 Fault Code: Overheat Sensor Short Circuit — Diagnosis and Fix
E06 (blink code 00110) on HLN air heaters means a short circuit on the overheat sensor — resistance below 500 ohms without combustion. The disconnect-and-rescan test tells you whether to replace the sensor or the ECU.
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Diesel Heater E05 Fault Code: Overheat Sensor Open Circuit — Diagnosis and Fix
E05 (blink code 00101) on HLN air heaters means an open circuit on the overheat sensor — resistance above 2000 kΩ. Measure between the blue and brown/white wires against the temperature-resistance table.
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