41 3P362438-1B English
Malfunction code
Contents Solution
Main
code
Sub code
Master/sub 1/sub 2
U2
01/08/11 INV1 voltage power shortage or open phase • Check if power supply is within range.
• Correct phase order.
02/09/12 INV1 reversed or open power supply phase • Check if power supply is within range.
• Correct phase order.
22/25/28 INV2 voltage power shortage or open phase • Check if power supply is within range.
• Correct phase order.
23/26/29 INV2 reversed or open power supply phase • Check if power supply is within range.
• Correct phase order.
U3
03
04
05
06
07
08
• Malfunction code: System test run not yet executed
(system operation not possible).
• Reversed or open power supply phase
• Faulty wiring to Q1/Q2 or indoor – outdoor
• Execute system test run.
• Correct phase order.
• Check (Q1/Q2) wiring.
U4
01 Faulty wiring to Q1/Q2 or indoor – outdoor Connect transmission wiring of indoor unit to “TO
IN/D UNIT (F1, F2)” and transmission wiring of other
outdoor unit to “TO OUT/D UNIT (F1, F2)”.
03 Malfunction of connected indoor unit. Check the malfunction code of indoor unit and resolve it.
04 System test run abnormal ending Execute test run again.
U7
01 Faulty wiring to Q1/Q2 or indoor – outdoor Connect transmission wiring of indoor unit to “TO
IN/D UNIT (F1, F2)” and transmission wiring of other
outdoor unit to “TO OUT/D UNIT (F1, F2)”.
02 Faulty wiring to Q1/Q2 or indoor – outdoor Connect transmission wiring of indoor unit to “TO
IN/D UNIT (F1, F2)” and transmission wiring of other
outdoor unit to “TO OUT/D UNIT (F1, F2)”.
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 (R410A, R407C, Mini-split, etc).
Indoor unit malfunction.
Check if other indoor units have malfunction and con-
rm indoor unit mix is allowed.
UA
03 Connection malfunction over indoor units or type
mismatch (R410A, R407C, Mini-split, etc).
Check if other indoor units have malfunction and con-
rm indoor unit mix is allowed.
18 Connection malfunction over indoor units or type
mismatch (R410A, R407C, Mini-split, etc).
Check if other indoor units have malfunction and con-
rm indoor unit mix is allowed.
20 Wrong combination (different series (e.g. RXYQ and
REYQ), or different type (e.g. P type and T type)).
Correct the units combination.
31
49
Wrong combination of outdoor units. Correct the units combination.
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 nished.
UF
01 Auto address malfunction (inconsistency) Check if transmission wired unit amount matches with
powered unit amount (by monitor mode) or wait till
initialization is nished.
05 Stop valve closed or wrong (during system test run) Open stop valves.
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