Error handling
65
11.9
Heat recovery too low
Calculate
new
Problem
solved
Efficiency
O.K.?
Check
temperature
measuring point
(directly at device
duct socket)
O.K.?
Check
temperature
sensor
O.K.?
Heat recovery
too low
Use other
sensor
No
Yes
WARNING!
Do not touch the board
for under 230 V power
supply live components!
No
Measure directly at
device duct socket
=
𝑡
𝑠𝑢
− 𝑡
𝑖𝑛
𝑡
𝑒𝑥𝑡
− 𝑡
𝑖𝑛
Check
calculation
formula
O.K.?
Yes
No
Check
Heat exchanger
Check
airflow when fan
speed 2 supply/extract or
intake/exhaust
Warning! measure in channel/
tube directly after
ventilation device
O.K.?
No
Balance
the system
Yes
Yes
No
Yes
