38
The air quality in the house is not good/there is regularly no supply or extraction of air to or from
the house
Cause
Solution
(a) One or both filters are dirty or clogged.
●
Clean or replace dirty/clogged filters.
(b) The valves are dirty/clogged.
●
Clean the valves.
(c) The valves are not properly adjusted.
●
Set the ventilation unit to the
commissioning position and adjust
the
system again.
d) The fan is not running (anymore).
●
See 'The fan is no longer running'.
Cold air is fed into the house
Cause
Solution
(a) The filter in the exhaust air is clogged.
●
Clean or replace the filter in the
air extraction.
(b) The valves are not properly adjusted.
●
Set the ventilation unit to the
commissioning position and adjust
the
system again.
(c) The bypass valve is incorrectly in bypass mode.
●
Clean the bypass valve if it is dirty.
●
Replace the bypass valve in its entirety
if it no longer functions.
(d) One of the temperature sensors is defective.
●
In the event of a defective supply air
temperature sensor: replace the wiring
harness with the temperature sensor in
the motor module.
●
In the event of a defective exhaust air
temperature sensor: replace the
complete exhaust air temperature
sensor.
bypass module.
