38
7.4
What, if...?
The following table lists symptoms of malfunction that may occur in daily operation of the Defensor
PH28/PH28A, together with possible causes and suggested remedies.
Symptom
Cause
Remedy
Unit does not work, LC display
remains dark
Unit is not connected to the mains. Connect unit to the mains.
Unit fuse blown.
Have a service technician of
your Defensor supplier check
the unit.
Unit does not humidify.
Humidifier drum does not turn.
Humidifier drum not correctly
installed.
Correctly install humidifier drum.
Gear wheel of the humidifier drum
must engage in the driving gear
wheel.
Ambient air humidity is higher
than selected reference value.
No remedy required, change ref
-
erence humidity value if neces
-
sary.
Level switch is defective. There
-
fore no error message is displayed
even though the water level in the
base tub is too low.
Have a service technician of your
Defensor supplier replace the
level switch
Room air does not reach the
set reference humidity value.
Evaporator mat not installed.
Install evaporator mat.
Room temperature too high.
Reduce room temperature to 20-
22°C.
Unit very dirty.
Perform maintenance (see
chapter 6)
Doors or windows are open.
Close doors and windows.
Prolonged ventilation of the room.
Therefore continuous replace
-
ment of the humidified room air
by dry outdoor air.
Ventilate room only a short time!
Room to large.
Contact your Defensor supplier.
Actual humidity much higher
than the reference value.
The actual humidity is higher than
the set reference air humidity.
Let unit running as air purifier.
Fan does not run
Humidification mode “Humidifica
-
tion” selected. Ambient humidity
is higher than selected reference
value.
None. Unit is working properly.
Unit is in program mode. The cur-
rently active program sets the fan
step to “0”.
None. Unit is working properly.
Fan defective.
Contact your Defensor supplier.
Base tub and rotary humidifi
-
cation drum have heavy slime
accumulation.
Silver coating on the water ionisa-
tion electrodes is worn.
Have a service technician of
your Defensor supplier replace
the water ionisation electrodes.
