Sigma Holzgas, Manual And Installation

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When [E 1] error appears on the display, it means fault in the boiler sensor
circuit or temperature below 0°C. [E 2] is displayed if boiler overheats. [E 3]
error means fault and overheating at the same time. Appearing of [E 1] error on
the display after erasing it by pressing STOP button, in spite of temperature
decreasing below 90°C, may mean permanent damage of boiler temperature
sensor (e.g. if the boiler has been overheated above 150°C). In case of
programming the sensor and central heating pump in the service mode the
controller tests the hot water sensor circuit. Appearing of fault [E8] means
damage or lack of hot water sensor.
Picture. 2. RK-2001W connection diagram