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
Supply air temperature too low
The supply air temperature is below the
fixed limit P240
Operating problem with the supply air
temperature sensor
Check the operation of the sensor
Operating problem with the heating
elements
Check the operation of the valves, heat recovery
unit, mixing box, etc.
Operating problem with the cooling
elements
Check the operation of the valves, heat recovery
unit, mixing box, etc.
Supply air temperature too high
The supply air temperature is below above
the fixed limit P241
Operating problem with the supply air
temperature sensor
Check the operation of the sensor
Operating problem with the heating
elements
Check the operation of the valves, heat recovery
unit, mixing box, etc.
Operating problem with the cooling
elements
Check the operation of the valves, heat recovery
unit, mixing box, etc.
7 - FAULTS
EN-47
FLOWAY
