Daikin FXYBP20K7V1, Service Manual

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Troubleshooting SiE 00-07
150 Troubleshooting R-407C PLUS Series
3.28 Malfunction of Transmission Between Remote Controller and Indoor Unit
Remote Controller
Display
U5
Supposed Causes Malfunction of indoor unit remote controller transmission
Connection of two main remote controllers (when using 2 remote controllers)
Defect of indoor unit PC board
Defect of remote controller PC board
Malfunction of transmission caused by noise
Troubleshooting
(VF055)
NO
YES YES
NO
Replace indoor unit PC board.
Set one remote controller to
"SLAVE"; turn the power supply off
once and then back on.
There is possibility of malfunction
caused by noise. Check the
surrounding area and turn on
again.
NO
NO
Using
2-remote controllers
control.
All indoor
PC board microcomputer
monitors blink.
YES
Multi-core
cable is used for the indoor
unit remote controller
transmission
wiring.
Operation
returns to normal when the
power is turned off
momentarily.
YES
YES
SS1
of both remote controllers is set
to "MASTER."
NO
Switch to double-core independent
cable. replacement
Defect of remote controller PC
board or indoor unit PC board.
Replace whichever is defective.