U5" Malfunction Of Transmission Between; Remote Controller And Indoor Unit - Daikin FCQ18PVJU Service Manual

SiUS28-902_a
U5
3.39 " " Malfunction of Transmission between Remote
Controller and Indoor Unit
U5
Remote
Controller
Display
Applicable AII indoor unit models
Models
Method of
In case of controlling with 2-remote controller, check the system using microcomputer is signal
Malfunction transmission between indoor unit and remote controller (main and sub) is normal.
Detection
Malfunction
Normal transmission does not continue for specified period.
Decision
Conditions
 Malfunction of indoor unit remote controller transmission
Supposed
 Connection of two main remote controllers (when using 2 remote controllers)
Causes
 Defect of indoor unit P.C.B.
 Defect of remote controller P.C.B.
 Malfunction of transmission caused by noise
Troubleshooting
Troubleshooting
Be sure to turn off the power switch before connecting or disconnecting
Caution
the connector, or parts could be damaged.
Using
YES
2-remote controllers
control.
NO
All indoor
NO
P.C.B. microcomputer
monitors blink.
YES
Multi-core
cable is used for the
YES
indoor unit remote controller
transmission
wiring.
NO
Troubleshooting by Indication on the Remote Controller
SS1 of
YES
both remote controllers
is set to "MAIN."
NO
Operation
NO
returns to normal when
the power is turned off
momentarily.
YES
Set one remote controller to
"SUB"; turn the power supply
off once and then back on.
Replace indoor unit P.C.B.
There is possibility of
malfunction caused by noise.
Check the surrounding area
and turn on again.
Switch to double-core
independent cable.
replacement
Defect of remote controller
P.C.B. or indoor unit P.C.B.
Replace whichever is
defective.
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