47
English
Error code
Contents
Solution
Main
code
Sub code
Master/sub 1
U4
01
Faulty wiring to Q1/Q2 or indoor- outdoor.
Connect transmission wiring of indoor units to “TO
IN/D UNIT (F1, F2)” and transmission wiring of other
outdoor units to “TO OUT/D UNIT (F1, F2)”.
09
10
11
12
13
14
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 indoor units to “TO
IN/D UNIT (F1, F2)” and transmission 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-
firm indoor unit mix is allowed.
UA
03
Connection malfunction over indoor units or type
mismatch (R407C, Mini-split, etc).
Check if other indoor units have malfunction and con-
firm indoor unit mix is allowed.
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 and outdoor units (e.g.
different models, number of units or part numbers, or
different series are mixed).
• 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.
31
Wrong combination of outdoor units.
Correct the units combination.
49
UH
01
Auto address malfunction (inconsistency)
Check if transmission wired unit amount matches with
powered unit amount (by monitor mode) or wait till
initialization is finished.
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 till
initialization is finished.
05
Stop valves closed.
Open stop valves.
01_EN_Main_VRV6_HP_IM.indd 47
01_EN_Main_VRV6_HP_IM.indd 47
2022/11/17 19:51:25
2022/11/17 19:51:25