Daikin REYQ8-48PY1B, Service Manual

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Troubleshooting by Indication on the Remote Controller SiBE37-701_B
349 Troubleshooting
3.52
“
U5
”
Indoor Unit: Malfunction of Transmission between
Remote Controller and Indoor Unit
Remote
Controller
Display
U5
Applicable
Models All indoor unit models
Method of
Malfunction
Detection In case of controlling with 2-remote controller, check the system using micro-computer is signal
transmission between indoor unit and remote controller (main and sub) is normal.
Malfunction
Decision
Conditions Normal transmission does not continue for specified period.
Supposed
Causes
„
Malfunction of indoor unit remote controller transmission
„
Connection of two main remote controllers (when using 2 remote controllers)
„
Defect of indoor unit PCB
„
Defect of remote controller PCB
„
Malfunction of transmission caused by noise
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Set one remote controller to
"SUB"; turn the power supply
off once and then back on.
Using 2-remote
controllers control.
YES
SS1 of both remote
controllers is set to
"MAIN."
All indoor PCB
micro-computer
monitors blink.
Replace the remote controller
Normal
Replace the indoor unit PCB.
Normal
Operation returns to
normal when the power is
turned off momentarily.
YES
NO
NO
NO NO
YES
YES
NO
NO
YES
YES
Replace the indoor unit PCB.
There is possibility of
malfunction caused by noise.
Check the surrounding area
and turn on again.
Normal
Normal
There is possibility of
malfunction caused by noise.
Check the surrounding area
and turn on again.