I A Troubleshooting - Mitsubishi Electric CLIMAVENETA BRAN2 0021M Installation, User And Maintenance Manual

TROUBLESHOOTING
FAULT
The unit doesn't start
Insufficient capacity
Compressor noisy
Noise and vibrations
Protection devices trip
and shut down the com-
pressor
CAUSE
Power failure
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
Power supply voltage too low
Contactor coil faulty
HSW15 controller fault
Start-up capacitor faulty (if featured)
Compressor faulty
Reversed phases (three-phase units only)
Insufficient refrigerant
Unit sized too small
Operation outside recommended limits
Liquid returning to compressor
Inadequate fastening
Contact between metal bodies
Weak foundations
Loose screws
Excessive discharge pressure
Low suction pressure
Low voltage
Electrical connections not sufficiently tight
Operation outside permitted limits
Faulty operation of pressure switches
Replace the component
U I A I
SOLUTION
Check presence of voltage
Check safety systems upstream of
the appliance
Switch ON
Check power line
Replace the component
Check
Check
Check
Repair
Tighten screws
Check
Replace the component
Circuit breaker tripped
Check supply voltage
Check electrical insulation of wind-
ings
BRAT2 - BRAN2 EN
A
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