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7.4 What, if...?
The following table lists symptoms of malfunction that may occur in daily operation of the Defensor
PH15/PH15A, 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. Ambient air humidity is higher
than selected reference value.
No remedy required, change
reference humidity value if nec-
essary.
Level switch is defective. There-
fore no error message is dis-
played even though the wa-
ter 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
replacement of the humidified
room air by dry outdoor air.
Ventilate room only a short
time!
Room to large. Contact your Defensor sup-
plier.
Actual humidity much higher
than the reference value.
The actual humidity is higher
than the set reference air hu-
midity.
Let unit running as air purifier.
Fan does not run Humidification mode “Humidi-
fication” selected. Ambient hu-
midity is higher than selected
reference value.
None. Unit is working prop-
erly.
Unit is in program mode. The
currently active program sets
the fan step to “0”.
None. Unit is working prop-
erly.
Fan defective. Contact your Defensor sup-
plier.
Base tub and evaporator mat
have heavy slime accumula-
tion.
Silver coating on the water ioni-
sation electrodes is worn.
Have a service technician of
your Defensor supplier replace
the water ionisation elec-
trodes.
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