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