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The fan suddenly starts running much faster or slower (for no apparent reason)
Cause
a) After using the timer function, the ventilation
unit switches back to the last selected speed
before the timer was started.
b) The RF remote control from a neighbouring
property is paired with this ventilation unit.
The ventilation unit is not responding to the three-position switch
Cause
a) Frost control is active.
b) The power is switched off.
c)
No power.
d) The switch wires of the three-position switch
are connected incorrectly.
e) The ventilation unit PCB is faulty.
The ventilation unit is leaking water
Cause
a) The condensate drain is not connected.
b) The condensate drain is blocked.
c)
The second condensate drain is open and not
connected (hissing sound).
The ducts leading outside are wet (on the outside) and/or are leaking water
Cause
a) The ducts leading outside are not thermally
insulated or vapour-tight.
b) The roof feedthrough is not rainproof or
vapour-tight.
The valves are noisy
Cause
a) No noise dampening hose has been installed
in the ducts leading into the dwelling.
b) The air valves are not correctly adjusted.
Solution
If desired, change the system setting.
●
Disconnect power to the ventilation unit
●
for 15 seconds. Unpair any paired RF
remote controls (and any RF sensors) and
re-pair the remote controls (and any RF
sensors).
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.
●
Connect the switch wires correctly (see
●
wiring diagram).
Replace the PCB and carry out the
●
commissioning procedure again.
Solution
Connect one of the two condensate
●
drains.
Unblock the condensate drain and try to
●
identify the cause of the problem.
Close the second condensate drain by
●
folding back the tab with the plug and
clicking it into the condensate drain.
Solution
Ensure that the ducts leading outside are
●
thermally insulated and vapour-tight over
their entire length.
Replace the existing roof feedthrough(s)
●
with rainproof and vapour-tight roof
feedthrough(s).
Solution
Install noise damping hoses on the ducts
●
leading into the dwelling.
Put the ventilation unit in commissioning
●
mode and readjust the system settings.
37
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