SiAF341904E
Troubleshooting by Error Code
Part 6 Service Diagnosis
185
5.3 Drain Level Control System Abnormality
Applicable
Models
FXFSQ-AR, FXMQ-PB
Error Code
A3
Method of Error
Detection
By float switch OFF detection
Error Decision
Conditions
Float switch goes OFF when the conditions for water level rise are not met
Supposed
Causes
220-240 V power supply is not provided.
Defective float switch or short circuit connector
Defective drain pump
Drain clogging, upward slope, etc.
Defective indoor unit control 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
Replace the indoor unit
control PCB (A1P).
Defective connection of
connector.
NO
NO
NO
YES
NO
NO
YES
NO
NO
Provide 220-240 V power
supply.
Go to the next page
YES
NO
Is power supply
220-240 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
