Power Supply Voltage Abnormality - Daikin VRV IV-S RXTQ-TAVJU Series Service Manual

Troubleshooting by Error Code
4.8

Power Supply Voltage Abnormality

A8
Error Code
Applicable
FXMQ-PB
Models
Method of Error
Error is detected by checking the input voltage of the fan motor.
Detection
Error Decision When the input voltage of fan motor is 150 V or less, or 386 V or more.
Conditions
Supposed
Causes
Troubleshooting
149
Defective power supply voltage.
Defective connection on signal line.
Defective wiring.
Instantaneous power failure, others.
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Check the condition
of the power supply.
(1) Check if power supply
voltage is 208-230 V
± 10%.
(2) Check if there is power
open phase or
defective wiring.
(3) Check if power supply
voltage unbalance is
within 6 V.
There
are problems on
the condition of power
supply described
above.
NO
A8
Reoccurrence of
error.
NO
YES
YES
SiUS331604E
Correct any fault.
Check and correct each wiring.
It is possible to have external
factor, such as brownout and
instantaneous power failure.
Service Diagnosis