24 - EN
2.10.3Malfunctions (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
The control circuit board is defective and must
be replaced.
No power supply
Mains power is off.
High intake temperature
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 temperature
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
■
Siphon is empty
■
Siphon does not seal properly
Reconnect the siphon.
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.
