Daikin FTKS50BVMB, Service Manual

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Caution for Diagnosis SiEN18-622
304 Troubleshooting
Caution: Operation stops suddenly. (Operation lamp blinks.)
Cause of above trouble could be "Operation mode butting".
Check followings;
Are the operation modes all the same for indoor units connected to Multi system outdoor unit?
If not set all indoor units to the same operation mode and confirm that the operation lamp is not
blinking.
Moreover, when the operation mode is in "Auto", set all indoor unit operation mode to "Cool" or
"Heat" and check again if the operation lamp is normal.
If the lamp stops blinking after the above steps, there is no malfunction.
H
Operation stops and operation lamp blinks only for indoor unit which the different operation
mode is set later. (The first set operation mode has priority.)
1.2 Troubleshooting with the LED on the SkyAir Indoor Unit
Foreword
Troubleshooting can be carried out by service monitor LED (green). (Blinks when normal)
4 : LED on 3 : LED off 5 : LED blinks — : No connection with troubleshooting
Note: 1. When the INSPECTION/TEST button of remote control is pushed, INSPECTION display
blinks entering INSPECTION mode.
2. In the INSPECTION mode, when the ON/OFF button is pushed and held for 5 seconds or
more, the aforementioned malfunctioning history display is off. In this case, after the
malfunction code blinks 2 times, the code display turns to “00” (=Normal) and the unit No.
turns to “0”. The INSPECTION mode automatically switches to the normal mode (set
temperature display).
3. Operation halts due to malfunction depending on the model or condition.
4. The wiring between indoor and outdoor unit may be incorrect or disconnected. Before
performing the previously described troubleshooting, check the wiring. If the outdoor unit is
inverter unit, the outdoor unit fuse may be blown.
5. Troubleshoot by turning off the power supply for a minimum of 5 seconds, turning it back on,
and then rechecking the LED display.
Microcomputer
Normal Monitor
Contents/Processing
HAP
5
Incorrect wiring between indoor and outdoor unit
If outdoor unit’s HAP is off, proceed outdoor unit’s trouble shooting. If outdoor
unit’s HAP blinks, failure of wiring or indoor or outdoor unit P.C board ass’y.
(Note 4)
4
Failure of indoor unit PC board ass’y (Note 5)
3
Malfunction of power supply or failure of PC board ass’y or broken
transmission wire between indoor and outdoor unit. (Note 5)