Installation Instructions

13
TROUBLESHOOTING
Problem Possible reasons Solving
The fan(s) do(es) not
start running.
Power supply is o.
Make sure the power supply line
is connected correct, otherwise
troubleshoot the connection error.
Thermal fuse is melted.
Disconnect the unit from power
mains. Remove the overload. Replace
the thermal fuse and check the unit.
Cold supply air.
The extract lter is clogged. Clean or replace the extract lter.
The heat recovery core is frozen.
Check the heat recovery core
condition. Shutdown the unit and
turn it on after the freezing danger
is no longer imminent. Check the
thermostat setpoints.
Low air capacity.
Too low set rotation speed. Check the speed control settings.
The lters, fans or heat recovery
core are clogged.
Clean or replace the extract lters;
clean the fans and the heat recovery
core.
The ventilation system is clogged
or damaged.
Check the diusers and louvre
gravity shutters opening, check the
exhaust hood and intake grille and
clean those if required; make sure
that the air ducts are not clogged or
damaged.
Noise, vibration.
The impeller(s) is (are) clogged. Clean the fan impeller(s).
Fan screw tightening is loose.
Check and tighten the screws if
required
Water leakage
The drain system is clogged,
damaged or wrong arranged.
Clean the drain pipe is required.
Check the drain pipe slope, U-trap
and temperature conditions.
Possible malfunctions and fault handling