44
English
Error code
Contents
Solution
Main
code
Sub code
Master/sub 1/sub 2
U3
03
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not possible).
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04
An error occurred during the test run.
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05
Test run aborted.
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06
07
Test run aborted due to communication issues.
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test run.
08
U4
01
Faulty wiring to Q1/Q2 or indoor- outdoor.
Connect transmission wiring of Branch Selector units
and indoor units to “TO IN/D UNIT (F1, F2)” and trans-
mission wiring of other outdoor units to “TO OUT/D
UNIT (F1, F2)”.
03
Malfunction of connected indoor unit.
Check the error code of indoor unit and resolve it.
U7
01
Faulty wiring to Q1/Q2 or indoor- outdoor.
Connect transmission wiring of Branch Selector units
and indoor units to “TO IN/D UNIT (F1, F2)” and trans-
mission wiring of other outdoor units to “TO OUT/D
UNIT (F1, F2)”.
02
11
• Too many indoor units are connected to F1/F2 line.
• Faulty wiring between units.
• Check indoor unit amount and total capacity con-
nected.
• Check connection.
U9
01
• System mismatch. Wrong type of indoor units com-
bined (R407C, Mini-split, etc).
• Indoor unit malfunction.
Check if other indoor units have malfunction and con-
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UA
03
Connection malfunction over indoor units or type
mismatch (R407C, Mini-split, etc).
Check if other indoor units have malfunction and con-
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18
20
Wrong combination (different series (e.g. RXYQ and
REYQ), or different type (e.g. A type and X type)).
Correct the units combination.
27
Assembly defect of indoor, Branch Selector and
outdoor units (e.g. different models, number of units or
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• Check and modify the number of indoor units that
are connected.
• Check the type of refrigerant for indoor and outdoor
units, and replace them with adaptable indoor/out-
door units in the case of inconsistency.
28
Different type of Branch Selector units are combined
in the system. Combination of T type (BSQ-T
, BS-
Q54T
, BSF-Q54T
) and P type (BSVQ-PVJU, BSV-
Q36PVJU) cause error.
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units.
31
Wrong combination of outdoor units.
Correct the units combination.
49
53
• Defect of Branch Selector units connecting position
or abnormality due to wiring error.
• Abnormality of Branch Selector units DIP switches
settings.
• Check that the wiring connection are correct, refer-
ring to the wiring diagram for Branch Selector units,
and correct if there are any errors.
• Check that the DIP switches settings are correct,
referring to the installation manual enclosed in
Branch Selector units package, or to the “Service
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and correct if there are any errors.
UH
01
Auto address malfunction (inconsistency)
Check if transmission wired unit amount matches with
powered unit amount (by monitor mode) or wait till
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UF
01
• Auto address malfunction (inconsistency)
• Wrong wiring detection
• Check if transmission wired unit amount matches
with powered unit amount (by monitor mode) or wait
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• Check whether the piping and wiring between the
indoor unit and Branch Selector unit are correct.
05
Stop valves closed.
Open stop valves.
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