Indoor Unit Pcb Abnormality - Daikin RZQ Series FCQ20EVA Service Manual

SiME281501E
4.5

Indoor Unit PCB Abnormality

A1
Error Code
Applicable
All indoor models
Models
Method of Error Check data from E²PROM.
Detection
Error Decision
The error is generated when the data from the E²PROM is not received correctly.
Conditions
E²PROM (Electrically Erasable Programmable Read Only Memory): A memory chip that holds
its content without power. It can be erased, either within the computer or externally and usually
requires more voltage for erasure than the common +5 volts used in logic circuits. It functions
like non-volatile RAM, but writing to E²PROM is slower than writing to RAM.
 Defective indoor unit PCB
Supposed
 External factor (Noise, etc.)
Causes
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Switch the power OFF and ON again
to restart.
Service Diagnosis
NO
Normal reset?
YES
Troubleshooting by Remote Controller
Replace the indoor unit PCB.
The error may be caused by an
external factor, rather than
damaged parts.
Locate the cause and correct
the situation.
92