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Technischer Support - The ELWA only flashes green, but never heats
The ELWA is configured at the factory for operation as a single device or in stratified charging mode as an upper device.
Probably the shift setting was unintentionally changed to "down" in setup mode.
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Knob setting
Simply put the ELWA back into setup mode (see installation and operating instructions) and correct the incorrect setting.
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By the way, in the software the setting "below" looks like this (language selection English):
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ELWA Software. This software is available for download free of charge.
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References
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