29 - EN
2.10.4 Malfunctions (or problems) without alerts
An overview of the malfunctions (or problems) without notifications 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 defective, 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 tempera-
ture in summer
Bypass remains closed
Reduce the comfort temperature
ComfoAir is still in Winter mode:
Bypass remains closed
Checking 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 filters
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
■
U bend. is empty
■
U bend. does not seal properly
Reconnect the U bend
Whistling noise
■
An air gap somewhere
Seal the air gap
Airflow 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 wiring 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 briefly from the
ComfoAir. Shortly after reconnecting
the power tune the switch again
