featured Diesel Heater E12 Fault Code: Water Temperature Sensor Open Circuit — Diagnosis and Fix
E12 (blink code 01100) on HLN coolant heaters means an open circuit on the water temperature sensor — resistance too high. A reading above 2000 kΩ or below 3 kΩ means the sensor is damaged and must be replaced.
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Diesel Heater E11 Fault Code: Temperature Sensor Short Circuit — Diagnosis and Fix
E11 (blink code 01011) means a temperature-sensor short circuit: the inlet air temperature sensor on air heaters, the water (coolant) temperature sensor on coolant heaters. On coolant heaters, a reading above 2000 kΩ or below 3 kΩ means the sensor is damaged.
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