Troubleshoot the problem according to the fault symptom as described in the table below:
12. Troubleshooting
Failure
Reason
Solution
Outdoor air coming into
the dwelling is cold
The unit has been
switched off
unexpectedly
The unit makes a lot of
noise
Water leakage near the
unit
Unpleasant smell near
the unit
Unpleasant cooking
smell in the house
Too much
condensation in the
bathroom
* Air cools down in the attic ducts
* The heat exchanger is frozen which is why
extract air cannot heat the incoming air
* The extract fan is not running
* The extract air filter or the heat exchanger
is clogged
Gurgling noise
* Condensate trap water level is too low
* Condensate pipe is not completely in the
trap
* Condensate pipe or condensate trap is
blocked or frozen
Rumbling/Rattling noise
* Fan motor fault
* Condensate trap is clogged or frozen
* Condensate pipe has come loose
* Condensate trap (U-bend) below the unit
is empty
* The condensate pipe is not completely in
the trap
* The condensate pipe or condensate trap
is blocked or frozen
* Air extract rates are too low
* The filters are polluted/blocked
* The grilles are dirty
* Air extract rates are too low
* Mains voltage failure
Check the duct insulation
If the heat exchanger is frozen
contact your supplier/installer to
reduce the set point of the frost
protection facility
Contact your supplier/installer
Check that the filters and the heat
exchanger are clean
Fill the condensate trap with water
Push the pipe deeper into the trap
Check the condensate drain and
clean it, if necessary
Contact your supplier/installer
Check the condensate drain and
clean it, if necessary
Fill the condensate trap with water
Push the pipe deeper into the trap
Check the condensate drain and
clean it, if necessary
Activate the boost speed when
cooking
Replace the filters
Clean all grilles
Activate the boost speed while
showering or bathing
Consult a qualified electrician to
check mains power supply to
units.
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