5.0 Troubleshooting
Symptom Cause How to solve
Noise from
the unit
If a-type unit: on rare occa-
sions, vibration can occur if unit
is mounted directly onto the
joists. Unit should be mounted
on a suitable platform.
If w-type unit: If the rubber spac-
ers have not been fitted at the
rear of the unit or if the silicone
strip was not fitted onto the wall
bracket.
A defective fan bearing will
produce a ‘grinding noise’.
For a-type models:
Check that unit has platform acc. to
installation manual.
For w-type models:
Check that rubber spacers and
silicone strip were fitted.
If fan ball bearing is suspected to be
defective, contact your installer.
Noise from
Air valves
Air flow is too high.•
Pressure is too high over valve.•
No silencer has been fitted to •
main duct.
In a correctly sized system, noise
will not be a problem. However, if
the air valves are accidently closed
during cleaning, this can cause a
hissing noise - so avoid turning the
valves when cleaning the ceiling.
Frost icon
on the display
Low outdoor temperatures
entail a risk of ice forming in the
heat exchanger - the system is in
defrost mode.
This is not an error, but a standard
mode. The function stops automati-
cally when the outdoor tempera-
ture rises.
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