Indoor Unit Control Pcb Abnormality - Daikin REYQ-XA Service Manual

Troubleshooting by Error Code
3.4

Indoor Unit Control PCB Abnormality

A1
Error Code
Applicable
All indoor unit models
Models
Method of Error Check data from EEPROM.
Detection
Error Decision When data could not be correctly received from the EEPROM
Conditions EEPROM : Type of nonvolatile memory. Maintains memory contents even when the power supply
Supposed
Causes
Troubleshooting
253
is turned OFF.
Defective indoor unit control PCB
External factor (Noise etc.)
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Turn the power supply OFF,
then the power ON again.
Does the
system return to
normal?
NO
YES
SiUS371901E
The indoor unit control PCB
(A1P) is normal.
External factor other than
error (for example, noise
etc.).
Replace the indoor unit
control PCB (A1P).
Service Diagnosis