42 - EN
4
You can find the correct connection in the technical specification chapter.
Malfunction code
SERVICE MODE.
The basic functions of the unit are stopped to enable the required maintenance to be carried
out.
Question
Answer
Action
1
Are you
performing any
maintenance?
Yes
Ignore the error and continue the maintenance procedure.
No
Go to the next question.
2
Is the standby
switch connected
to the option box
closed?
Yes
Open the standby switch.
No
Stop the SERVICE MODE.
Malfunction code
TEMP_HRU
The outdoor air temperature is too high or low.
The unit is switched off.
Question
Answer
Action
1
Is or was the
temperature
between -30°C
and +120°C?
Yes
1. Reset the errors as instructed in the chapter “How to reset errors”.
2. Go to the next question.
No
1. Solve the problem causing the extreme temperature.
2. Reset the errors as instructed in the chapter “How to reset errors”.
3. Perform all maintenance actions to check if there is permanent damage to the system.
4. Go to the next question.
2
Did the error come
back?
Yes
Follow the instructions of the SENSOR_ETA ERROR / SENSOR_ODA ERROR / SENSOR EHA ERROR /
SENSOR_SUP ERROR table.
Malfunction code
TEMP_SENSOR_ETA ERROR /
TEMP_SENSOR_ODA ERROR /
TEMP_SENSOR EHA ERROR /
TEMP_SENSOR_SUP ERROR.
The extract / outdoor exhaust / supply air temperature sensor is detecting an incorrect
temperature.
Question
Answer
Action
1
Is or was the
temperature
between -40°C
and +70°C
Yes
Make sure that the temperature inside the unit is within the allowed temperature range:
1. When the outdoor temperature is within the allowed tempartature range: Set the unit to PRESET 3 to
speed up the temperature change in the unit.
2. When the temperature inside the unit is within the allowed temperature range: Inspect the heat
exchanger as instructed in the chapter “Maintenance of the heat exchanger”.
3. Reset the errors as instructed in the chapter “How to reset errors”.
4. Go to the next question.
No
Inspect the heat exchanger as instructed in the chapter “Maintenance of the heat exchanger”.
1. Reset the errors as instructed in the chapter “How to reset errors”.
2. Go to the next question.
2
Did the error
come back?
Yes
1. Inspect the heat exchanger as instructed in the chapter “Maintenance of the heat exchanger”.
2. Follow the instructions of the SENSOR_ETA ERROR / SENSOR_ODA ERROR / SENSOR EHA ERROR
/ SENSOR_SUP ERROR table.
No
1. Inspect the heat exchanger as instructed in the chapter “Maintenance of the heat exchanger”.
2. Follow the procedure for ending the maintenance.
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
1
Is or was the
outdoor air
temperature
below 0°C?
Yes
1. Wait till the outdoor temperature increases above 0°C.
2. Reset the errors as instructed in the chapter “How to reset errors”.
No
Check the return air temperature.
2
Is or was the
return air
temperature
below 12°C?
Yes
1. Increase the return air temperature above 12°C.
2. Reset the errors as instructed in the chapter “How to reset errors”.
No
1. Check if the extract fan is switched on.
2. Go to the next question.
3
Is the extract fan
running?
Yes
1. Disconnect the power to the unit.
2. Remove the design front from the unit.
3. Connect the power to the unit.
Be aware of the danger for electrical shocks and
rotating parts.
3. Go to the next question.
No
1. Switch the extract fan on.
2. Reset the errors as instructed in the chapter “How to reset errors”.
