Daikin VRV IV-S RXTQ-TAVJU Series Service Manual page 91

SiUS331604E
Error code
Primary Sub
code code
U4 01
03
04
U9 01
UA 03
18
31
49
UF 01
05
UH 01
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.
Caution
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.
Field Setting
Description
Q1/Q2 or indoor-outdoor units wiring error
Q1/Q2 or indoor-outdoor units wiring error
System test operation ends abnormally.
System mismatch
Mismatched indoor unit models used (R-410A,
R-407C, RA, Hydrobox, etc.).
Defective indoor unit
Defective indoor unit connection or mismatched
models (R-410A, R-407C, RA, Hydrobox, etc.).
Defective indoor unit connection or mismatched
models (R-410A, R-407C, RA, Hydrobox, etc.).
Wrong combination of units (multi-unit system)
Wrong combination of units (multi-unit system)
Defective automatic addressing (inconsistency)
Stop valve closed or defective (During system
test operation)
Defective automatic addressing (inconsistency)
Solution
Check (Q1/Q2) wiring.
Check (Q1/Q2) wiring.
Re-execute the test operation.
Check if there are any other defective indoor
units and verify if the indoor unit combination
meets requirements.
Check if there are any other defective indoor
units and verify if the indoor unit combination
meets requirements.
Check if there are any other defective indoor
units and verify if the indoor unit combination
meets requirements.
Check the compatibility of unit types.
Check the compatibility of unit types.
Check if the quantity of connected units is below
the maximum number of units that can be
connected (through monitoring mode) or if
initiation is complete.
Open the stop valve.
Check if the quantity of connected units is below
the maximum number of units that can be
connected (through monitoring mode) or if
initiation is complete.
Test Operation
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