Repair Procedures - Daikin Sky Air FAA71BUV1B Service Manual

5 | Third party components

5.1.2 Repair procedures

To perform a communication reset
To correct the wiring from the main power supply terminal to the indoor unit power supply
terminal
Service manual
86
INFORMATION
Correct the wiring as needed.
Is the problem solved?
Yes
No
NOTICE
If an indoor unit is powered OFF when communication reset is performed, the
outdoor unit will delete this indoor unit information since this unit will not be
identified during re-initialization. If so, this unit will not be recognized by the outdoor
unit upon power restore to this indoor unit.
1 Set multimeter to V DC measurement. The example below is performed while
COM-F1 and V DC-F2, the polarity will be opposite than the graph below if
connected otherwise (which is not a problem).
y
a
16 VDC
-16 VDC
a Y: Voltage (VDC)
b X: Time
2 Push BS3 (RETURN) and hold it for 5 seconds until the 7-segment display
shows "000". Then release BS3.
Result: After a while, voltage will drop to almost 0 V DC. At this stage it means
that re-initialization has started.
Result: Depending on the system size, voltage will rise to 16 V DC and hit 0 V
back again several times.
Result: When finished, 7‑Segment Display will turn OFF. This indicates that re-
initialization has completed.
The time this procedure takes, depends on the amount of indoor units.
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see
Action
No further actions required.
Return to the troubleshooting of the
specific error and continue with the
next procedure.
b e
f
c d
x
4
"4.6 Plate work" [ 60].
FAA71+100BUV1B
Sky Air indoor units
ESIE22-01 – 2022.02