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33
C5.1-16-03-v1
Message Possible cause Elimination
External re alarm
A re signal has been received from the re signali-
zation system of the building.
Delete alarm message and restart the unit when
the re signal disappears.
External stop
A signal from an external device (switch, timer, or
sensor) has been received.
As soon as the auxiliary device is switched off, the
unit will operate in the previous mode.
Heat exchanger failure
Blocked or not rotating rotor, by-pass damper fail-
ure.
Check the rotor drive, replace the belt or check the
by-pass channel operation.
Heat exchanger icing
Icing may form under a low outdoor temperature
and high room humidity.
Check the operation of the rotation heat exchan-
ger drive or the air bypass damper of the plate
heat exchanger.
Low supply air tempera-
ture
The heating equipment fails to operate or its ca-
pacity is insufcient.
Check the heating equipment.
High supply air tempera-
ture
The heating equipment is not controllable (mixing
valve or contactor is blocked).
Check the heating equipment.
Electric heater overheat
The emergency overheating protection of the elec-
trical heater has actuated.
Protection can be reset only by pressing the RE-
SET press-button on the heater.
Evaporator air tempera-
ture sensor failure
The evaporator air temperature sensor is not con-
nected or broken.
Check connections of the sensor or replace the
sensor.
Evaporator icing
The evaporator is iced over due to excessively high
humidity content in the exhaust air and low outdoor
temperatures.
Check the operation of the evaporator defrost
system.
High pressure on com-
pressor
Compressor system operated in an overload
mode as a result of too high temperature in the
condensing unit.
Indentify the cause and eliminate it.
Low pressure on com-
pressor
Compressor system is leaky or the amount of
refrigerant is insufcient.
Indentify the cause and eliminate it.
Compressor failure
No power supply.
Check supply voltage on the circuit breaker and/or
make sure whether it is on.
Supply voltage mismatches.
Check that the supply voltage is on all three phas-
es, if necessary, swap the two phase conductor
positions.
Compressor motor failure.
Check the compressor motor and replace it if nec-
essary.
Compressor drive failure.
Check the operation of the compressor drive and
replace it if necessary.
Supply fan drive failure
A fault signal has been received from the supply
fan drive.
Check the supply fan drive and its messages.
Supply fan drive overload The supply fan drive is overloaded.
Check the condition of the supply fan drive and its
cooling.
Supply fan motor failure The supply fan is broken. Check the supply fan and replace it if necessary.
Supply fan motor overload The supply fan is overloaded.
Check the condition of the supply fan and make sure
that the resistance of the ventilation system is not
exceeded.
Exhaust fan drive failure A fault signal has been received from exhaust fan drive. Check the exhaust fan drive and its messages.
Exhaust fan drive over-
load
The exhaust fan drive is overloaded.
Check the condition of the exhaust fan drive and
its cooling.
Exhaust fan motor failure The exhaust fan is broken. Check the exhaust fan and replace it if necessary.
Exhaust fan motor over-
load
The exhaust fan is overloaded.
Check the condition of the exhaust fan and make
sure that the resistance of the ventilation system is
not exceeded.
Rotor drive failure A fault signal has been received from the rotor drive. Check the rotor drive and its messages.
Rotor drive overload The rotor drive is overloaded. Check the condition of the rotor drive and its cooling.
Rotor motor failure The rotor motor is broken. Check the rotor motor and replace it if necessary.
Rotor motor overload The rotor motor is overloaded.
Check the condition of the rotor motor and make
sure that the rotor is not blocked.
Communication error
No communication with the internal components of
the air handling unit (controller extension modules,
frequency converters, fans, etc.) or one / several
of them are broken.
Check internal connections and functioning of
separate components.
Controller failure Main controller module fault. Replace the main controller.
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