GF JRG Coral force 5000, Инструкция по установке и эксплуатации

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Operating modes and indicators
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9.8 Error messages / malfunctions
An error or a problem exists only if the red LED is continuously lit up. The error
code is given on the display.
If the red LED is not lit up, the display indicates the current operating condition.
If the yellow LED lights up, the catalyst granulate/cartridge must be replaced. ->
see Maintenance and service
In the event of an operational malfunction, an audible alarm is sounded and the red LED (ERROR)
lights up.
The BCT contact (signal contact) is opened (signal = 0).
The audible alarm can be acknowledged by pressing and holding the M button
for three seconds.
Errors can be reset by unplugging and plugging in again.
Should an error persist, it will be displayed again during commissioning
(  see Commissioning).
If the self-test (04) returns an error, an attempt can be made to fix it based on the
troubleshooting guide, or by contacting factory customer service.