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7. Faults
The fan has stopped
Cause
a) Frost control is active.
b) The power is switched off.
c)
No power.
d) The fan is blocked or stuck due to heavy
soiling.
e) The fan is defective.
f)
The ventilation unit PCB is faulty.
The ventilation unit is noisy
Cause
a) The fan is blocked or stuck due to heavy
soiling.
b) The fan is imbalanced.
c)
The unit is mounted on a wall/ceiling/floor with
insufficient load-bearing capacity.
d) The ducts are not correctly connected to the
unit.
e) The second condensate drain is open and not
connected (hissing sound).
f) The bypass valve is blocked (rattling noise).
Solution
When the outside temperature rises
●
above -1°C, the fan will start running
again.
Install a pre-heater in the supply duct for
●
outside air.
Switch the power back on.
●
Restore power.
●
Clean the fan impeller. Watch out for the
●
balance clips.
Replace the entire motor module.
●
Replace the PCB and carry out the
●
commissioning procedure again.
Solution
Clean the fan impeller. Watch out for the
●
balance clips.
Replace the entire motor module.
●
If the ventilation unit cannot be
●
relocated, try using vibration dampers to
decouple it from the wall, ceiling or floor.
Check the connections and ensure that
●
fixed ducts are clamped to the wall,
ceiling or floor.
Close the second condensate drain by
●
folding back the tab with the plug and
clicking it into the condensate drain.
The bypass valve strikes the stop during
●
the self-test after power is switched on.
Wait 30 seconds and check whether the
noise has stopped.
Inspect the valve. Clean it if it has
●
become blocked with dirt. Replace the
valve if there is a different cause of the
fault.
35
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