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Voltage detection circuit of sub1 out-
1
4
8
door unit
Low/high voltage of sub2 outdoor
1
4
9
unit
Voltage detection circuit of sub2 out-
1
5
0
door unit
Failure of operation mode conver-
1
5
1
sion
Failure of Main constant speed com-
1
7
3
pressor operation
Failure of Sub1 constant speed
1
7
4
compressor1 operation
Failure of Sub1 constant speed
1
7
5
compressor2 operation
Failure of Sub2 constant speed
1
7
6
compressor1 operation
Failure of Sub2 constant speed
1
7
7
compressor2 operation
Failure of Sub3 constant speed
1
7
8
compressor1 operation
Failure of Sub3 constant speed
1
7
9
compressor2 operation
I Please refer to trouble shooting guide in service manual for each error title
CAUTION
In case that the control box is opened and before checking electrical parts, it should be checked that
the LED 01Y (Refer to next page) turned off (wait 3 minutes after main power OFF), otherwise, it may
cause electrical shock.
Title
Voltage detection circuit of sub1 outdoor unit is out of
order
Input voltage of sub2 outdoor unit is more than 487V or
less than 270V
Voltage detection circuit of sub2 outdoor unit is out of
order
Pressure unbalance between outdoor units
Comp locking, Check Valve leakage, comp dielectric
breakdown
Comp locking, Check Valve leakage, comp dielectric
breakdown
Comp locking, Check Valve leakage, comp dielectric
breakdown
Comp locking, Check Valve leakage, comp dielectric
breakdown
Comp locking, Check Valve leakage, comp dielectric
breakdown
Comp locking, Check Valve leakage, comp dielectric
breakdown
Comp locking, Check Valve leakage, comp dielectric
breakdown
Test Run
Cause of Error
Installation Manual 77
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