Drain Level Control System Abnormality - Daikin RXYQ-TA Series Service Manual

Troubleshooting by Error Code
3.3

Drain Level Control System Abnormality

A3
Error Code
Applicable
FXFQ, FXZQ, FXUQ, FXEQ, FXDQ, FXMQ-PB, FXMQ-M (Option), FXAQ (Option)
Models
Method of Error By float switch OFF detection
Detection
Error Decision When rise of water level is not a condition and the float switch goes OFF.
Conditions
Supposed
Causes
Troubleshooting
177
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
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Is power supply
208-230 V provided?
YES
The
float switch is
connected to the indoor
unit PCB. (∗1)
YES
The
float switch
contact is forming a
short circuit (continuity check
with the connector (∗1)
disconnected)
NO
Water builds up
in the drain pan.
YES
The
drain pump
is connected to
the indoor unit
PCB. (∗2)
YES
A
NO
A short circuit
NO
connector is
connected. (∗1)
YES
Becomes
normal when the
YES
connector (∗1) of the
indoor unit PCB is
short circuited.
YES
NO
The float switch
functions normally.
YES
NO
SiUS341615E
Provide 208-230 V power
supply.
NO
Connect either a short circuit
connector or float switch and
turn ON again.
NO
Replace the indoor unit main
PCB (A1P).
Loose the connection of
connector.
NO
Replace the float switch (S1L).
Modify the float switch's
connection and turn ON again.
Connect the drain pump and
turn ON again.
Service Diagnosis