Drain Level Control System Abnormality - Daikin VRV Aurora RXLQ-TATJU Series Service Manual

Troubleshooting by Error Code
3.5

Drain Level Control System Abnormality

Applicable
FXFQ-AA, FXFQ-T, FXFQ-P, FXZQ-TA, FXZQ-TB, FXZQ-M, FXUQ-P, FXUQ-PA, FXEQ-P,
Models
FXDQ-M, FXSQ-TA, FXSQ-TB, FXMQ-PB, FXMQ-TB, FXMQ-TA (Option)
A3
Error Code
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
 208-230 V power supply is not provided
Causes  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
233
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
NO
Is power supply
208-230 V provided?
YES
The float
switch is
NO
connected to the indoor
unit control PCB.
(∗1)
YES
The
float switch
contact is forming a
YES
short circuit (continuity check
with the connector (∗1)
disconnected)
NO
NO
Water builds up
in the drain pan.
YES
The
drain pump is
NO
connected to the
indoor unit control
PCB. (∗2)
YES
A Go to the next page.
A short circuit
NO
connector is
connected. (∗1)
YES
Becomes
normal when the
NO
connector (∗1) of the
indoor unit control PCB
is short circuited.
YES
NO
The float switch
functions normally.
YES
SiUS341802EC
Provide 208-230 V power
supply.
Connect either a short circuit
connector or float switch and
turn ON again.
Replace the indoor unit
control PCB (A1P).
Loose the connection of
connector.
Replace the float switch (S1L).
Modify the float switch's
connection and turn ON again.
Connect the drain pump and
turn ON again.
Part 6 Service Diagnosis