Troubleshooting
Fault
Causes
Remedies
Insufficient air capacity and insufficient
pressure
a) Clogged pipelines and/or suction points
b) Clogged impeller
c) Overloaded filter
d) Insufficient rotation speed
e) Clogged heat exchanger
a) Pipelines and suction point cleaning
b) Impeller cleaning.
c) Filter cleaning or replacement
d) Supply voltage check if necessary, correct
e) Heat exchanger cleaning
Exchange air temperature
too cold
External air lower than to -5°C
Employ of post-heating devices
Insufficient heat exchanger
performance
Exchange vanes are dirty
Heat exchanger cleaning
Difficult start
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
Performance drop after a period of
acceptable operation
a) Circuit leak before and/or after the fan
b) Damaged impeller
a) Circuit check and restoration of original
conditions
b)Check the impeller, if necessary replace through
an original spare part
Air pulsation
The fan capacity conditions are near
zero - flow instability, clogging or wrong
connection
Increase the min. speed on the electronic speed-
regulator (insufficient voltage)
Modify the circuit and/or replace the fan.
Clean and/or restore 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 microprocessor control
EVO PH/EVO D PH
Fault
Causes
Remedies
Fans alert
Failure or objects blocking the fan
Verify that anything blocks the functioning of the
fans: in the case, proceed with removal
Filters alert
Clogged filters
Replace the filters
Probes alert
Failure
Replace probes by technicians
Display/LED OFF
Machine not powered
Check the correct connection between the control
panel and electronic card
Communication error
(KO communication)
Error in the wiring of the remote panel
Make the electrical connections following the
instructions in the wiring diagram
