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2VV.
Creating innovative solutions for you and your business since 1995.
8. MALFUNCTIONS
8.1 MALFUNCTIONS
Disconnect the main power supply before any intervention to the unit. If you are not sure of the correct steps,
do not attempt to perform any repairs and call a professional service!
Description
Unit
behaviour
Likely problem
Solution
44 – Fan
error
Unit
out of order
Overheated fan or defect on thermal
contact of inlet fan
Determine the cause of the overheating (defective
bearing, short-circuit...) or replace the motor. Check the
thermal contacts from the motor to the regulator.
45 – Mandatory
maintenance/filter
clogged
Unit
operational
Filter clogged or the time to
maintenance
Replace filters. After replacing or device maintenance, do
not forget to reset the MENU 1616 – FILTER TIMER
46 – Heater
malfunction
Unit
out of order
Heater malfunction
Check the heater and the condition of the safety
thermostat Does the heater have proper cooling?
Check engine running.
47 - malfunction in
external temperature
sensor (45,46)
Unit
out of order
Temperature sensor malfunction on
terminals 45,46
Check that the sensor is correctly connected to the
electronics or test it measuring its resistance (the
resistance value at +20°C is around 10k
W
)
48 – Outlet temperature
sensor malfunction
(49,50)
Unit
out of order
Temperature sensor malfunction on
terminals 49,50
Check that the sensor is correctly connected to the
electronics or test it measuring its resistance (the
resistance value at +20°C is around 10k
W
)
49 – Inlet temperature
sensor malfunction
(51,52)
Unit
out of order
Temperature sensor malfunction on
terminals 51,52
Check that the sensor is correctly connected to the
electronics or test it measuring its resistance (the
resistance value at +20°C is around 10k
W
)
60 – Exchanger’s
return sensor
malfunction (53,54)
Unit
out of order
Temperature sensor malfunction on
terminals 53,54
Check that the sensor is correctly connected to the
electronics or test it measuring its resistance (the
resistance value at +20°C is around 10k
W
)
61 – Room temperature
sensor malfunction
(55,56)
Unit
out of order
Temperature sensor malfunction on
terminals 55,56
Check that the sensor is correctly connected to the
electronics or test it measuring its resistance (the
resistance value at +20°C is around 10k
W
)
62 - malfunction in
external temperature
sensor from BMS
Limited
operation of
the device
Temperature sensor malfunction in
BMS
Check that in the BMS that the address where the
sensors sends the data is properly set
(on the right regulator) Check the function of the sensor
in the BMS
63 - malfunction in room
temperature sensor
from BMS
Limited
operation of
the device
Temperature sensor malfunction in
BMS
Check that in the BMS that the address where the
sensors sends the data is properly set
(on the right regulator) Check the function of the sensor
in the BMS
79 – Heating reduced
due to low air flow
Unit
operational
Only information
The air flow settings were reduced, limiting the heater
output to prevent overheating
65 – Communication
error
Unit out of
order
Communication error
Check the communication cable for damages and if it
is properly connected Observe the wiring diagram to
prevent occurrences that may disrupt communication
(wiring near high tension, phenomena on site causing
disruptions)
Unit’s not working
Unit
out of order
Power supply interrupted
Check that the power supply is not interrupted
Blown fuse
Check the fuse in side the control module
The heating switches
off automatically
Unit
operational
but not
heating
The heater overheats
The heater overheats due to insufficient air flow. Check
that the ventilators are in good order and that the air
supply is not disrupted.
