Test Operation SiUS281811EA
192 Part 5 Field Settings and Test Operation
No display on the remote controller
Error in connection/communication among indoor unit remote controllers. Check if there is any
disconnection or loosening of connectors.
For the plumber
For the electrician
Before giving the air conditioner back to the customer after a test operation, please make sure that
the casing is securely in place and the screws are well fastened.
U4
01 Q1/Q2 or indoor-outdoor units wiring error Check (Q1/Q2) wiring.
03 Q1/Q2 or indoor-outdoor units wiring error Check (Q1/Q2) wiring.
04 System test operation ends abnormally. Re-execute the test operation.
U9 01
System mismatch
Mismatched indoor unit models used (R-410A,
R-407C, RA, Hydrobox, etc.).
Defective indoor unit
Check if there are any other defective
indoor units and verify if the indoor unit
combination meets requirements.
UA
03
Defective indoor unit connection or
mismatched models (R-410A, R-407C, RA,
Hydrobox, etc.).
Check if there are any other defective
indoor units and verify if the indoor unit
combination meets requirements.
18
Defective indoor unit connection or
mismatched models (R-410A, R-407C, RA,
Hydrobox, etc.).
Check if there are any other defective
indoor units and verify if the indoor unit
combination meets requirements.
31 Wrong combination of units (multi-unit system) Check the compatibility of unit types.
49 Wrong combination of units (multi-unit system) Check the compatibility of unit types.
UF
01
Defective automatic addressing
(inconsistency)
Check if the quantity of connected
units is below the maximum number of
units that can be connected (through
monitor mode) or if initiation is
complete.
05
Stop valve closed or defective (During system
test operation)
Open the stop valve.
UH 01
Defective automatic addressing
(inconsistency)
Check if the quantity of connected
units is below the maximum number of
units that can be connected (through
monitor mode) or if initiation is
complete.
A0 01
External protection device abnormality Check if 24 VAC power has been
supplied to R and C terminals.
Check if TB4 and TB5 terminals have
not been opened.
Check F1U fuse.
Error code
Description Solution
Primary
code
Sub
code
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