Cold air flow.
Contaminated filters.
Heat exchanger icing.
Tripping of the temperature
switch.
Wrong selected ventilation
system.
Clean or replace the filters.
Check the heat exchanger for icing.
In case of the heat exchanger icing
turn the unit off and let the ice melt.
To prevent subsequent icing
increase the response temperature
of the thermal switch.
Noise,
vibration.
Contaminated fans.
Loose screw connection.
No anti-vibration mounts are
installed.
Clean the fans.
Check the screw connection and
tighten the screws if required.
Use the anti-vibration mounts for the
unit mounting (available as specially
ordered accessories).
Water
leakage.
The drainage system is soiled,
damaged or frozen.
Wrong mounting angle of the
unit or the drain system.
Check the mounting angle of the unit
toward the drain pipe. Clean the drain
line, if required. Check the drain line
slant, inspect the U-trap and make
sure the drain line is frost protected.
3
5
VUT EH EC
VUT EH EC
Problem
Possible
reasons
Remedy