33
HOLDING REGISTERS (Read/Write)
Modbus Adress Register Values Description Default Data type
40068 Min ETA-ODA for by-pass 30-60 dºC
Minimum difference
between ETA-ODA for
by-pass
30 dºC 16 bit word
40133 Selected airflow
0 Manual (low airflow)
0
16 bit word
1 Manual (medium airflow) 16 bit word
2 Manual (nominal airflow) 16 bit word
3 Auto 16 bit word
4 Snooze 16 bit word
10. REPAIRING FAULTS
10.1. MALFUNCTIONS
Malfunction
The air supplied into the living space is cold.
Cause Remedy
The air cools down in the ducts. • Check installation and operation of the system.
• Check insulation of outdoor and outgoing air lines.
Supply air fan and extract air fan are not
properly balanced.
• Adjust airflow rates using a differential pressure gage (see page 18).
Malfunction
• The ventilation system no longer works.
• The fans do not rotate.
• The control panel does not work.
Cause Remedy
The mains voltage is interrupted. • Set up the mains voltage again.
A fuse has burned out in the ventilation
system.
• Call in customer service of the specialised company, check fuse and have
it replaced.
Malfunction
The ventilation system is loud and vibrates.
Cause Remedy
A fan is off-balance. • Request customer service from the specialised company, check fan and, if
needed, have it replaced.
Malfunction
The ventilation system is dripping.
Cause Remedy
The condensate cannot drain. • Call in customer service of the specialised company and check whether
condensate line, condensate tray and syphon dryer are in proper working
order; have them cleaned.
Malfunction
The supply air fan is off.
Cause Remedy
Summer mode is on. • Turn off summer mode, if you no longer desire it, see page 30.
The anti-freeze feature is on.
Normal operation of the ventilation system. The symbol is lit
while anti-freeze feature is activated.
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