Daikin VRV RXYQ72-384XAYCA, Service Manual

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SiUS342004EB Troubleshooting by Error Code
Part 6 Service Diagnosis 232
3.5 Drain Level Control System Abnormality
Applicable
Models
FXFQ-AA, FXFQ-T, FXZQ-TA, FXZQ-TB, FXUQ-P, FXUQ-PA, FXEQ-P, FXDQ-M, FXSQ-TA,
FXSQ-TB, FXMQ-PB, FXMQ-TB, FXMQ-TA (Option)
Error Code
A3
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 control PCB

Loose connection of connector
Troubleshooting
Caution
Be s u re to t u rn off the power switch b efore connecting or disconnecting
connectors, or parts may b e damaged.
Replace the float switch (S1L).
Modify the float switch's
connection and t
u rn ON again.
Connect the drain p u mp and
t u rn ON again.
Connect either a short circ u it
connector or float switch and
t
u rn ON again.
YES
YES YES
YES
YES
Replace the indoor u nit
control PCB (A1P).
Loose the connection of
connector.
NO NO
NO
YES
NO
NO
YES
NO
NO
Pro v ide 208-230 V power
s u pply.
YES
NO
Is power s u pply
208-230 V pro v ided?
Water bu ilds u p
in the drain pan.
A short circ u it
connector is
connected. (
∗
1)
The float switch
f u nctions normally.
The float
switch is
connected to the indoor
u nit control PCB.
(
∗
1)
The
drain p u mp is
connected to the
indoor u nit control
PCB. (
∗
2)
The
float switch
contact is forming a
short circ u it (contin u ity check
with the connector (
∗
1)
disconnected)
Becomes
normal when the
connector (
∗
1) of the
indoor u nit control PCB
is short circ u ited.
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