Daikin SUPER MULTI NX G Series, Service Manual

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Caution for Diagnosis SiUS12-928_A
91 Service Diagnosis
1. Caution for Diagnosis
1.1 Troubleshooting with LED
Indoor unit The operation lamp blinks when any of the following errors is detected.
1. When a protection device of the indoor or outdoor unit is activated, or when the thermistor
malfunctions.
2. When a signal transmission error occurs between the indoor and outdoor units.
In either case, conduct the diagnostic procedure described in the following pages.
Duct-Free System
Slim Duct Built-in System
Caution: When operation stops suddenly and the operation lamp blinks, it could be "operation mode
conflict".
Check the following:
Are the operation modes all the same for the indoor units connected to multi system outdoor unit?
If not, set all the indoor units to the same operation mode and confirm that the operation lamp is not
blinking.
Moreover, when the operation mode is automatic, set all the indoor unit operation modes as
"cooling" or "heating" and check again if the operation lamp is normal.
If the lamp stops blinking after the above steps, there is no malfunction.

Operation stops and the operation lamp blinks only for the indoor unit for which a different
operation mode is set later. (The first set operation mode has priority.)
Operation lamp (green)
Air outlet
Indicator lamps
(R8245)
OPERATION lamp (green)
(Q0340)