25 - EN
2.10.4 Malfunctions (or problems) without alerts
An overview of the malfunctions (or problems) without notifi cations is given below.
Problem/Malfunction Indication
Check / action
System switched off Power supply on
Check the fuse on the control circuit
board.
•
If the fuse is Defect, replace fuse.
•
If the fuse is OK, the control circuit
board is defective and must be
replaced.
No power supply
Mains power
is off.
High intake temper-
ature in summer
Bypass remains closed
Reduce
the comfort temperature.
ComfoAir is still in Winter mode:
Bypass remains closed
Cheking the Mode of the ComfoAir is
possible with special read-out software.
•
Wait untill ComfoAir switches to
Summer mode.
Low intake tempera-
ture in winter
Bypass stays open
Increase
the comfort temperature.
Little or no
air supply;
shower remains
damp
Filters blocked
Replace
the fi lters.
Valves blocked
Clean
the valves.
Exchanger clogged by dirt.
Clean
the exchanger.
Exchanger frozen
Defrost
the exchanger.
Fan dirty
Clean
the fan.
Ventilation ducts blocked
Clean
the ventilation ducts.
ComfoAir is in frost-protection
operation
Wait until the weather warms up.
Too noisy
Fan bearings defective
Replace
the fan (bearings).
Fan settings to high
Change
the fan (settings).
Slurping noise
• Siphon is empty
• Siphon does not seal properly
Reconnect
the siphon.
Whistling noise
• An air gap somewhere
Seal
the air gap.
Airfl ow noise
• Valves do not close onto duct.
• Valves not open far enough
Reinstall
the valves.
Reset
the valves.
Condensation leak
Condensation drain clogged
Unblock
the condensation drain.
Condensation from exhaust duct
does not run into leakage tray
Check
whether the connections
are correct.
Corded 3-position
switch not working
Cabling is not correct
Check
the wire-circuit of the
3-position switch by
measuring the voltage:
• Voltage only on N & L3:
[Fans rotate in position 1].
• Voltage only on N & L3 & L2:
[Fans rotate in position 2].
• Voltage only on N & L3 & L1 or
N & L3 & L2 & L1:
[Fans rotate in position 3].
Switch is defective
Wireless 3-position
switch not working
Battery is discharged
Check
the battery.
•
Replace
the battery (if necessary).
Switch is not correctly tuned.
Remove the power shortly from the
ComfoAir. Shortly after reconnecting
the power tune the switch again.
