Technical data

Fault/malfunction Symptom Display Check
E1 Fan defective
E1 Fan pcb defective
Fan not running
Control pcb defective
Filter clogged
Valves/grilles clogged
Heat exchanger clogged
Fan soiled
No or insufficient
exhaust air; bathroom
or shower remains
damp for too long
Fan running
Ducts clogged
E1/E2 Impeller binding or is
broken
Bearings defective
Air intake or air
exhaust fan
Fan running too fast. No
or insufficient intake /
exhaust air
Bypass flap jammed Bypass
Bypass motor defective
Scraping noise Siphon does not close
Whistling noise Air leaks at unit or duct
system
Valves/grilles not open
sufficiently
Valves/grilles not
correctly connected to
duct
Loud noise
Air flow noise
Fan running too fast. No
or insufficient intake /
exhaust air
Siphon is empty
Drain clogged
Condensation leak
Drain line leaking at the
collecting tray
Wiring fault
Switch defective
Control pcb
3-position switch has
no function
E1/E2 Fan
Interference on TV/
stereo system
EMC filter