SERVICE MANUAL
FAN WORKS AT ONE SPEED ONLY(FMI)
Check electrical conec-
NO
Fit electrical connec -
tions. Is there continuity ?
tions properly
YES
Check power supply
NO
Replace the electronic
on electronic
control (CE)
control contacts (CE)
YES
Check fan motor winding
values (FMI))
YES
Replace fan motor (FMI)
POOR COOLING
Is the unit cooling capacity
NO
Suggest a more power-
suitable for the room
ful unit
thermal loads ?
YES
Are both air filters and heat
NO
Clean filters and / or
exchanger cleaned ?
heat exchanger
YES
Check if difference bet-
YES
The unit works properly
ween room air
temperature and outlet air
delivered is up to 10 °C
NO
Low
NO
gas charge
Proceed with
normal operations
foreseen for the
above points
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