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Service IPP 200-500/HPP 108 | 10/2008
H18. umidification and/or dehumidification does
not work properly
(only for constant climate chambers HPP 108)
If humidification or dehumidification does not work properly for
HPP 108 constant climate chambers (see also operating instruc-
tions), there may be several different causes. It is described below
how the fault can be determined and what needs to be done to
remedy this.
First check whether an error message of the control module for
humidification/dehumidification is displayed at the front of the
appliance (see operating instructions). If this is the case, the con-
trol module must be replaced (see page 39).
If this is not the case, check whether an error message from the
humidity sensor is displayed. If this is the case, the humidity sen-
sor must be replaced (see page 40).
If no error message is displayed, proceed as follows:
H18.1 umidification is not working properly
If humidification (increase of humidity in the chamber) is not
working properly, this can be seen by the fact that the humidity
display on the control panel does not change if a higher humidity
is set (see operating instructions). Reducing the humidity (dehu-
midification) works, however.
Proceed as follows to determine the cause:
Check whether there is water in the external tank/canister (1); 1.
if not, fill it up with distilled water.
Check whether the water tubes on the appliance and on the 2.
steam generator (3) on the rear side of the appliance are con-
nected properly (2). If not, make sure that they are fastened
tight.
1
2
3
Checking the tube connectionsFig. 24:
Water tank/canister1
Tube connections2
Steam generator3
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