18
Troubleshooting
Fault
Causes
Remedies
pressure
Insufficient air capacity and insufficient
a) Clogged pipelines and/or
suction points
b) Clogged impeller
c) Overloaded filter
d) Insufficient rotation speed
e) Clogged heat exchanger
a) Clean pipelines and suction point cleaning
b) Clean impeller
c) Filter cleaning or replacement
d) Supply Voltage check and if necessary, correct
e) Clean Heat exchanger
Heat Exchanger discharge air
temperature too low
a) External air lower than to -5°C
a) Employ of post-heating devices
performance
Insufficient Heat Exchanger
a) Buid up of dirton Heat Exchange fins
a) Clean Heat exchanger
a) Reduced supply voltage
b) Insufficient motor static torque
a) Check motor plate data
b) Close the air locks to reach full
speed. If necessary, replace the motor
Airflow performance drop after a
period of
Difficult start
acceptable operation
a) Air leak before and/or after the fan
b) Damaged impeller
a) Circuit check and restore to original
condition
b)Check impeller, If necessary, replace with
an original spare part
Air pulsation
The fan performance set too near
zero-flow causing instability, Clogged
or wrong ductwork connection
Increase minimum speed on the electronic speed-
Modify the circuit and/or replace the fan.
regulator (insufficient voltage)
Clean and/or replace the suction duct
Excessive vibrations
Rotating parts unbalance.
Check the impeller balance: in case, restore or
replace it. Through an original spare-part.
Other troubleshooting for unit with EVO PH / EVO D PH microprocessor control
Fault
Causes
Remedies
Fan alert
Fan Failure or objects blocking the fan
Check for a fan blockage:
in the case of a failure, proced with removal/
replacement
Filter alert
Prob alert
Probe Failure
Clogged filters
Arrange for service technicians to replace probes
Replace the filters
