Daikin Aurora Series, Service Manual

Page: 183 / 333

SiUS341802E Troubleshooting by Error Code
Service Diagnosis 170
2.3 Drain Level Control System Abnormality
Error Code
A3
Applicable
Models
FXFQ, FXZQ, FXUQ, FXEQ, FXDQ, FXSQ-TA, FXMQ-PB
Method of Error
Detection
By float switch OFF detection
Error Decision
Conditions
When rise of water level is not a condition and the float switch goes OFF.
Supposed
Causes
„
208~230 V power supply is not provided
„
Defective float switch or short circuit connector
„
Defective drain pump
„
Drain clogging, upward slope, etc.
„
Defective indoor unit PCB
„
Loose connection of connector
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Replace the float switch (S1L).
Modify the float switch's
connection and turn ON again.
Connect the drain pump and
turn ON again.
Connect either a short circuit
connector or float switch and
turn ON again.
YES
YES YES
YES
YES
Go to the next page.
Replace the indoor unit main
PCB (A1P).
Loose the connection of
connector.
NO NO
NO
YES
NO
NO
YES
NO
NO
Provide 208-230 V power
supply.
YES
NO
Is power supply
208-230 V provided?
Water builds up
in the drain pan.
A short circuit
connector is
connected. (
∗
1)
The float switch
functions normally.
The
float switch is
connected to the indoor
unit PCB. (
∗
1)
The
drain pump
is connected to
the indoor unit
PCB. (
∗
2)
The
float switch
contact is forming a
short circuit (continuity check
with the connector (
∗
1)
disconnected)
Becomes
normal when the
connector (
∗
1) of the
indoor unit PCB is
short circuited.
A