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4. If the supply air sensor is in error state.
5. If the supply air fan is not running.
6. If the heater is set to disabled in the menu.
10.2.1.9 Overheat protection reset button
If the supply air temperature is low, it can indicate that the over heat protec-
tion is triggered. The overheat protection can be reset by pressing the reset
button.
10.3 Troubleshooting
If problems should occur, please check the items below before calling your service representative.
Malfunction
Fans do not start
Reduced airflow
The unit cannot be
controlled (control
functions are stuck)
212024 | A003, rev 29
Action
1. Check the HMI for alarms.
2. Check that all fuses and fast couplings are connected (main power supply and fast
couplings for supply and extract air fans).
3. Check that the week schedule is ON and running in AUTO mode. The week schedule
might be in OFF mode with the air flow set to OFF (chapter 7.7.3).
1. Check the HMI for alarms. Some alarms can reduce the airflow to LOW if active.
2. The unit could be in defrost mode. This reduces the fan speed and in some cases shuts
down the supply air fan completely during the defrosting cycle. The fans go back to
normal after finished defrosting. There should be a defrosting function icon visible in the
APP or HMI home screen if defrosting is active.
3. If the outdoor air temperature is below 0°C (Outdoor air temperature sensor (OAT)
measures < 0°C) outdoor airflow compensation function can be active (if enabled). Fan
speed (Supply or Supply/Extract air fans) is linearly reduced for decreasing outdoor air
temperature.
4. Check if temporary user mode that reduces airflow is not activated, for example AWAY,
HOLIDAY, etc. Also check digital inputs CENTRAL VACUUM CLEANER and COOKER HOOD.
5. Check setting of airflow in the HMI.
6. Check week schedule settings (chapter 7.7.3).
7. Check filters. Is change of filters required?
8. Check diffusers/louvres. Is cleaning of diffusers/louvres required?
9. Check fans and heat exchange block. Is cleaning required?
10.Check if the buildings air intake and roof unit (exhaust) have been clogged.
11.Check visible duct runs for damage and/or build up of dust/pollution.
12.Check diffuser/louvre openings.
1. Reset control functions by pulling out the plug for 10 seconds.
2. Check the modular contact connection between the HMI and the main printed circuit
board.
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