Daikin VRV RXYQ72-384XAYCA, Service Manual

Page: 335 / 419

SiUS342004EB Troubleshooting by Error Code
Part 6 Service Diagnosis 328
3.61 Check Operation Not Executed
Applicable
Models
All outdoor unit models
Error Code
U3
Method of Error
Detection
The check operation has not been executed.
Error Decision
Conditions
Error is decided when the unit starts operation without check operation.
Supposed
Causes
Check operation not executed.
Troubleshooting
The contents of indi v id u al
fail u res v ary with s ub code.
Ens u re the s ub code, and
then go to the following:
Cond u ct the test operation.
(The test operation has not
b een cond u cted.)
U3-03
Check for the refrigerant
piping, and then cond
u ct
the test operation.
U3-04
Cond u ct the test operation
(d u e to the premat u re end
of the test operation).
U3-05
Cond u ct the test operation
(d u e to the premat u re end
of the test operation).
U3-06
Check for transmission
b etween indoor and
o u tdoor u nits, and then
cond u ct the test operation.
U3-07
Check for transmission
b etween indoor and
o u tdoor u nits, and then
cond u ct the test operation.
U3-08
Caution
Be s u re to t u rn off the power switch b efore connecting or disconnecting
connectors, or parts may b e damaged.