Troubleshooting For Fdmq Series; Indoor Unit Pcb Abnormality - Daikin FTX-N Series Service Manual

SiUS091601EA

6. Troubleshooting for FDMQ Series

6.1

Indoor Unit PCB Abnormality

A1
Error Code
Method of Error
The system checks the data from EEPROM.
Detection
Error Decision
When the data from the EEPROM is not received correctly
Conditions
EEPROM (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 EEPROM is slower than writing to RAM.
Supposed  Defective indoor unit PCB
Causes  External factor (noise etc.)
Troubleshooting
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Turn off the power. Then, turn on
the power to restart the system.
Normal?
YES
NO

Troubleshooting for FDMQ Series

Replace the indoor unit PCB
(control PCB).
External factor other than malfunction
(for example, noise etc.)
(R22247)
138