7.5 - Diagnostics
Fault
Sources
Causes
Solutions
Powered down
The power supply has been cut
The circuit breaker has been
triggered
Check the wiring and the components
Voluntary stop
Empty
Fire protection
The "fire protection" contact has
been triggered
Triggered by the fume detector or by
the external fire contact managed by
the operator
Check the condition of the contacts
Frost protection
The supply air temperature sensor
detects a temperature below
threshold P248
(4°C by default)
The air temperature at the outlet for
the
1st hydraulic coil is too cold
Check the operation of the first coil:
valve jammed, no flow, no hot water, etc.
Intake EC motor
An EC motor is indicating a fault
Overvoltage, motor overload, motor
power supply problem, etc.
Check the condition of the intake
motor(s)
Exhaust EC motor
Check the condition of the exhaust
motor(s)
Intake air flow low limit
Extraction air flow low limit
The air flow rate is below the fixed
limit P111
The air passage is blocked
Check the pressure drops and ensure
there are no foreign bodies in the ducts
and
the unit
The pressure measurement sensor
is defective
Check the operation of the sensor
Constant pressure control: the
pressure drops in the network are
too great
Check the opening/closing of the duct
network dampers
Intake filter 1 fouled
The pressure drop in the filter is
greater than the "filter fouled"
threshold
The filter is dirty
Schedule replacement of the filter before
it becomes clogged
Exhaust filter 1 fouled
Intake filter 1 blocked
The filter pressure drop is greater
than the "filter blocked" threshold
The filter is blocked
Replace the filter
Exhaust filter 1 blocked
Intake flow rate pressure
sensor
The pressure sensor signal is less
than 0.5 V
The sensor is faulty
Replace the sensor
Extraction filter pressure
sensor
Intake flow rate pressure
sensor
Incorrect connection
Check the electrical connection and
tightness of the connections
Exhaust flow rate pressure
sensor
Heat recovery unit pressure
sensor
Rotary heat exchanger
The rotary heat recovery unit
indicates a fault
The heat recovery unit controller has
detected a fault
Check the operation of the heat recovery
unit and the condition of the belt
Heat recovery frosted
The pressure drops measurement
for the heat recovery unit is greater
345 Pa
Operating problem with the
differential pressure sensor
Check the operation of the sensor
The heat recovery unit is clogged
Clean the heat recovery unit
The heat recovery unit is frozen
Wait for the heat recovery unit to be
defrosted
Electric heater safety
thermostat
One of the safety thermostats for an
electric heater has been tripped
The temperature in the electric
heater is greater than the thermostat
limit (80 °C)
Check that the air flow is sufficient and
check the condition of the switches and
the electric heater
Intake duct pressure too low
The duct pressure is below the fixed
limit P124
Operating problem with the intake
pressure sensor
Check the operation of the sensor
Operating problem with the FMAs
Check the maximum frequency of the
inverter/motor and check that the motor
turns correctly
Intake duct pressure too high
The duct pressure is above the fixed
limit P125
Operating problem with the intake
pressure sensor
Check the operation of the sensor
Operating problem with the FMAs
Check the maximum frequency of the
inverter/motor
Exhaust duct pressure too low
The duct pressure is below the fixed
limit P142
Operating problem with the intake
pressure sensor
Check the operation of the sensor
Operating problem with the FMAs
Check the maximum frequency of the
inverter/motor and check that the motor
turns correctly
Exhaust duct pressure too
high
The duct pressure is above the fixed
limit P143
Operating problem with the intake
pressure sensor
Check the operation of the sensor
Operating problem with the FMAs
Check the maximum frequency of the
inverter/motor
7 - FAULTS
47
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