Service documentation series KB/KBF
BB / JTU 25.06.2000
Check List - Humidity too less (D2-Controller and SM-Controller)
Most common faults with KBF is too less humidity take this list for trouble shooting
Pos. Remark
1 Water conductivity
2 Waterinlet pressure 1-10bar
3 Wateroutlet without any counterpressure
4 Test function of the Solid valve with 230V
5 Test the swimming switch, down position OK (located behind the steam cylinder)
6 Set controller to 80% r.H.
7 Measure voltage at controller pin 343 and 342 (new D2 controller with the green text
display) , or between pin 42-43 (old SM controller) The correct voltage for max. steam
production is 4,5 V
8 Measure voltage 4 and 5 from the humidity board (target of above point)
9 Water level in the steamgenerator (plastic bottle)?
10 Measure current which is flowing between the electrodes
11 L3 board: LED at the humidity board (LED shows to the bottom)
green voltage OK
yellow steam production
red blinking error message, permanent steam generator full
Or in case of old EM2-board:
Blinking red LED means faulty humidity board
Highlighted red LED means max. filling level of the steam cylinder is reached (means too
less water conductivity)
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