Dantherm HCV 300, Manual, Page: 45 / 60

45
INSTALLATION & SERVICE MANUAL FOR PROFESSIONALS
Maintenance and care
: Error list
en
A B C
Error
code
Error Possible cause
Action
required
Reset
3 R 0 E 3 Bypass damper
does not close as
expected
Selector switch
position A:
Bypass is closed,
but supply air
temperature
is lower than
expected
Check if Bypass is
enabled in PC Tool
Automatic reset
if efficiency is
high enough for
30 seconds
Check if bypass is
blocked
Check the me-
chanical connection
between the bypass
actuator and the
bypass valve
Selector switch
position B:
Bypass is closed,
but exhaust air
temperature
is higher than
expected
Check electrical
connection between
controller and bypass
Check controller
output
Bypass damper
Reduced heat re-
covery due to low
exhaust airflow
Dirty extract air
filter
Change filters Automatic reset
if efficiency is
high enough for
30 seconds
Poor balancing of
airflows
Adjust the system
An extract fan in
the bathroom is
creating negative
pressure in the
house
Remove extract
fan from the bath-
room
and instead
connect the extract
air from the bath-
room
to the fan
system
An extract air fan
in the kitchen is
creating negative
pressure in the
house
Ensure that warm
make-up
air can reach the
cooker hood.
If this is not
possible, open a
window/door while
the cooker hood is
running
A cooker fan is
creating negative
pressure in the
house
Contact your flue/
stove supplier for
information about
safety precautions
3 R 0 E3 Bypass is closed,
but supply air
temperature
is lower than
expected
The airflows are
out of balance.
There is more
extract air than
supply air
Dirty supply air
filter
Change filters
Poor balancing of
airflows
Adjust the system