BRA2 - BRN2 EN
37
U I A
TROUBLESHOOTING
AI
Power failure
Power supply voltage too low
Switch QF1 in OFF position
Remote switch (if featured) in OFF position
Control panel in standby
Main switch QS1 in OFF
Compressor circuit breaker OFF
Check presence of voltage
Check safety systems upstream of
the appliance
Check power line
Switch ON
Contactor coil faulty
HSW15 controller fault
Start-up capacitor faulty (if featured)
Compressor faulty
Reversed phases (three-phase units only)
Replace the component
Check
Replace the component
Check
Check
Check
Protection devices trip
and shut down the com-
pressor
Excessive discharge pressure
Low suction pressure
Low voltage
Electrical connections not sufficiently tight
Operation outside permitted limits
Faulty operation of pressure switches
Circuit breaker tripped
Check supply voltage
Check electrical insulation of wind-
ings
Replace the component
Insufficient capacity
Insufficient refrigerant
Unit sized too small
Operation outside recommended limits
Noise and vibrations
Contact between metal bodies
RepairWeak foundations
Tighten screws
Loose screws
Compressor noisy
Liquid returning to compressor
Inadequate fastening
The unit doesn’t start
FAULT CAUSE SOLUTION
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