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E26 (blink code 11010) on HLN coolant heaters means the atmospheric-pressure sensor inside the ECU reads implausibly high. The only remedy is to replace the ECU.

E22 (blink code 10110) on HLN coolant heaters means the water pump is drawing too much current — a stalled, shorted, damaged or debris-jammed pump. A simple current measurement tells you whether to replace the pump or the ECU.

E14 (blink code 01110) on HLN coolant heaters means the flame went out after a successful start. Work down the factory list: fuel level, fuel quantity test, air leaks, intake/exhaust, fuel grade, glow pin, water circulation, then flame sensor or ECU.

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.