Troubleshooting
4.5
Errors in the humidification module
Fault localization
Humidification module variant A
•
Correct manipulation, but no steam
enters the useable volume
Humidity switch (
-8S1
) defective?
Yes
Replace humidity switch (chap. 8.4)
No
Steam boiler (-
9A10
) heats up?
No
See error description on next page
“Steam boiler doesn’t heat up”
Yes
Water in the steam boiler?
Check the water level in the steam boiler by briefly opening the discharging screw (E) on the bottom
side of the steam boiler.
Yes
No
•
Steam valve (-
9Y10
) does not open
- Check the steam valve for its mechanical
and electrical function,
if necessary, replace the humidification
module, chap. 9.1.6
•
Solid state relay (
-9K1
) defective
- Check the solid state relay (chap. 8.6)
replace if necessary.
•
Control of humidification module controller
output BA5 on the controller MB1 I/O-
board (
-3N2
) defective or controller MB1
I/O-board defective
- Check controller output BA5 (chap. 8.8)
and, if necessary, replace the
controller MB1 I/O-board (chap. 8.8.1)
•
Water pump of humidification module
(-9M10) defective
•
- Check the electrical connection (230 V~),
if necessary, replace the humidification
module, chap. 9.1.6
•
Calcification of boiler inlet, boiler sensor
and / or of the back pressure valve
- Decalcify as far as possible, if necessary
replace components.
•
Steam boiler inlet blocked
•
Control board (-9N10 ) of the humidifica-
tion module defective
•
- Check the output (230 V~) to the water
pump of the steam boiler (-9M10 ),
if necessary, replace the humidification
module, chap. 9.1.6.
Service Manual KBF (E5.2) 04-2015
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