Service manual

Troubleshooting by Indication on the Remote Controller SiUS28-902_a
133 Troubleshooting
3.37 “U3” Check Operation not Executed
Remote
Controller
Display
U3
Applicable
Models
RZQ18~30PVJU
Method of
Malfunction
Detection
Check operation is executed or not
Malfunction
Decision
Conditions
Malfunction is decided when the unit starts operation without check operation.
Supposed
Causes
 Check operation is not executed.
Troubleshooting
Has the
check operation
performed on Outdoor
unit P.C.B.?
Push the BS4 on P.C.B. on the
master outdoor unit for 5 seconds
or more to execute check
operation.
Replace the main P.C.B. on the
outdoor unit.
NO
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.