42 - EN
EN - 43
Malfunction code
TEMP_SUP_MIN ERROR
The supply air temperature is too low.
the supply fan is switched off for atleast 1 hour, in order to prevent condensation.
Question
Answer
Action
4
Did the modulating
bypass valves move?
Yes
1. Disconnect the power to the unit.
2. Access the main board as instructed in the chapter “How to gain access to the main board”.
3. Go to the next question.
No
1. Get the modulating bypass actuator service set.
2. Replace the modulating bypass actuator as instructed in its supplied manual.
3. Follow the procedure for ending the maintenance.
4. Reset the errors as instructed in the chapter “How to reset errors”.
5
Are the
connections at
the main board
correct?
4
Yes
1. Inspect the modulating bypass valves as instructed in the chapter “Maintenance of the modulating
bypass valves”.
2. Go to the next question.
No
1. Reconnect the modulating bypass actuator connector as described in the technical specification
chapter.
2. Follow the procedure for ending the maintenance.
3. Reset the errors as instructed in the chapter “How to reset errors”.
6
Is the connection
at the modulating
bypass actuator
correct?
Yes
1. Get the modulating bypass actuator service set.
2. Replace the modulating bypass actuator as instructed in its supplied manual.
3. Follow the procedure for ending the maintenance.
4. Reset the errors as instructed in the chapter “How to reset errors”.
No
1. Reconnect the connector of the modulating bypass valve.
2. Follow the procedure for ending the maintenance.
3. Reset the errors as instructed in the chapter “How to reset errors”.
Malfunction code
UNBALANCE ERROR
The airflow balance (or unbalance setting) cannot be guaranteed.
This error will reset automatically when the problem is solved.
Question
Action
1
Is there an error
message on the
unit display?
Yes
1. Solve the errors as instructed in their relevant troubleshooting table.
2. If the error is still present go to the next question.
No
Go to the next question.
2
Is there an
external unit
present which
can influence the
air pressure in the
dwelling (e.g. roof
fan)?
Yes
1. Turn off the external unit causing the change in air pressure.
2. If the error is still present go to the next question.
No
Go to the next question.
3
Are the filters
blocked?
Yes
1. Replace the filters
2. If the error is still present go to the next question.
No
Go to the next question.
4
Are the valves
blocked?
Yes
1. Clean the valves
2. If the error is still present go to the next question.
No
Go to the next question.
5
Is the heat
exchanger
clogged by dirt?
Yes
1. Clean the heat exchanger
2. If the error is still present go to the next question.
No
Go to the next question.
6
Is the heat
exchanger
frozen?
Yes
1. Defrost the heat exchanger
2. If the error is still present go to the next question.
No
Go to the next question.
7
Is the fan dirty?
Yes
1. Clean the fan
2. If the error is still present go to the next question.
No
Go to the next question.
8
Are the ventilation
ducts blocked?
Yes
1. Clean the ventilation ducts.
2. If the error is still present go to the next question.
No
Go to the next question.
9
Is there air
leakage in the
ductwork system?
Yes
1. Solve air leakage
2. If the error is still present go to the next question.
No
Check the pressure sensors as descripted in the EXT_PRESSURE_EHA ERROR / EXT_PRESSURE_SUP
ERROR table.
4
You can find the correct connection in the technical specification chapter.